Comprehensive MCQ Assessment: Inorganic Compounds and
Materials with Focus on Coordination Chemistry
1. Which of the following is not a type of inorganic compound?
a) Acids
b) Bases
c) Salts
d) Proteins
Answer: d) Proteins
2. In coordination compounds, the central metal atom or ion is called:
a) Ligand
b) Coordinator
c) Chelate
d) Coordination center
Answer: d) Coordination center
3. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
4. Which of the following is an example of a monodentate ligand?
a) Ethylenediamine
b) Ammonia
c) Oxalate ion
d) EDTA
Answer: b) Ammonia
5. The coordination number of the complex [Co(NH3)6]Cl3 is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
6. In the crystal field theory, which d orbitals are higher in energy in an octahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: b) dx2-y2, dz2
7. Which of the following is not a common geometry for coordination compounds?
a) Tetrahedral
b) Octahedral
c) Pentagonal
d) Square planar
Answer: c) Pentagonal
8. The IUPAC name for the complex K3[Fe(CN)6] is:
a) Potassium hexacyanoferrate(III)
b) Potassium ferricyanide
c) Potassium hexacyanoferrate(II)
d) Potassium ferrocyanide
Answer: a) Potassium hexacyanoferrate(III)
9. Which of the following is an example of a chelating ligand?
a) H2O
b) Cl-
c) NH3
d) Ethylenediamine
Answer: d) Ethylenediamine
10. The oxidation state of chromium in the complex K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
11. Which of the following statements about coordination compounds is false?
a) They can be colored
b) They always have a positive charge
c) They can be paramagnetic
d) They can have different geometries
Answer: b) They always have a positive charge
12. In the spectrochemical series, which ligand creates the strongest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) CN-
Answer: d) CN-
13. The compound [Pt(NH3)2Cl2] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: c) Geometrical isomerism
14. Which of the following is not a postulate of Werner's theory of coordination compounds?
a) Metals possess two types of valencies
b) Every metal has a fixed coordination number
c) Primary valencies are ionizable
d) Secondary valencies are directed in space
Answer: b) Every metal has a fixed coordination number
15. The hybridization of the central atom in a square planar complex is:
a) sp3
b) dsp2
c) sp3d2
d) d2sp3
Answer: b) dsp2
16. Which of the following is an example of an organometallic compound?
a) NaCl
b) K2Cr2O7
c) Ferrocene
d) CuSO4
Answer: c) Ferrocene
17. The term "ambidentate ligand" refers to:
a) A ligand that can bond through different atoms
b) A ligand that can bond to multiple metal centers
c) A ligand that has multiple charges
d) A ligand that changes the coordination number
Answer: a) A ligand that can bond through different atoms
18. Which of the following is not a factor affecting the stability of coordination compounds?
a) Nature of the central metal ion
b) Nature of the ligands
c) Color of the complex
d) Chelate effect
Answer: c) Color of the complex
19. The compound [Co(en)3]Cl3 (where en = ethylenediamine) exhibits:
a) Geometrical isomerism
b) Linkage isomerism
c) Optical isomerism
d) Coordination isomerism
Answer: c) Optical isomerism
20. In the naming of coordination compounds, which of the following is written first?
a) The name of the metal
b) The name of the anionic ligands
c) The name of the cationic ligands
d) The oxidation state of the metal
Answer: b) The name of the anionic ligands
21. The 18-electron rule is most applicable to:
a) Main group elements
b) Lanthanides
c) Transition metals
d) Actinides
Answer: c) Transition metals
22. Which of the following is an example of a homoleptic complex?
a) [Co(NH3)6]Cl3
b) [Co(NH3)5Cl]Cl2
c) [Co(en)2Cl2]Cl
d) K3[Fe(CN)5NO]
Answer: a) [Co(NH3)6]Cl3
23. The term "hapticity" in organometallic chemistry refers to:
a) The number of metal-carbon bonds
b) The number of atoms in a ligand bonded to the metal
c) The oxidation state of the metal
d) The total electron count of the complex
Answer: b) The number of atoms in a ligand bonded to the metal
24. Which of the following statements about the trans effect is correct?
a) It is a thermodynamic effect
b) It affects the rate of substitution reactions
c) It is only observed in square planar complexes
d) It is determined by the incoming ligand
Answer: b) It affects the rate of substitution reactions
25. The coordination number of the central metal in the complex K4[Fe(CN)6] is:
a) 4
b) 6
c) 3
d) 8
Answer: b) 6
26. Which of the following is not a common oxidation state for iron?
a) +2
b) +3
c) +4
d) +6
Answer: d) +6
27. The compound [Co(NH3)5Cl]SO4 is an example of:
a) Double salt
b) Coordination compound
c) Simple salt
d) Covalent compound
Answer: b) Coordination compound
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
28. In crystal field theory, which of the following would result in a high-spin complex?
a) Strong field ligands
b) Weak field ligands
c) Third-row transition metals
d) Square planar geometry
Answer: b) Weak field ligands
29. The hybridization of the central atom in [Ni(CO)4] is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: c) sp3
30. Which of the following is not a property of coordination compounds?
a) Catalytic activity
b) Color
c) High melting point
d) Magnetic properties
Answer: c) High melting point
31. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
32. Which of the following is an example of a bridging ligand?
a) NH3
b) H2O
c) OH-
d) Cl-
Answer: c) OH-
33. The coordination number of the central metal in [Pt(NH3)2Cl2] is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4
34. Which of the following is not a type of isomerism exhibited by coordination compounds?
a) Linkage isomerism
b) Ionization isomerism
c) Coordination isomerism
d) Resonance isomerism
Answer: d) Resonance isomerism
35. The IUPAC name for the complex [Cr(H2O)4Cl2]Cl is:
a) Tetraaquadichlorochromium(III) chloride
b) Dichlorotetraaquachromium(III) chloride
c) Chromium(III) chloride tetrahydrate
d) Chromium(II) chloride tetrahydrate
Answer: a) Tetraaquadichlorochromium(III) chloride
36. Which of the following ligands is considered to be the strongest in the spectrochemical
series?
a) F-
b) CO
c) CN-
d) H2O
Answer: b) CO
37. The compound K3[Fe(CN)6] is an example of:
a) Double salt
b) Simple salt
c) Coordination compound
d) Covalent compound
Answer: c) Coordination compound
38. Which of the following is not a factor affecting crystal field splitting?
a) Nature of the metal ion
b) Oxidation state of the metal
c) Geometry of the complex
d) Temperature
Answer: d) Temperature
39. The term "chelate effect" refers to:
a) The increased stability of complexes with multidentate ligands
b) The color change in complexes
c) The magnetic properties of complexes
d) The tendency of complexes to form precipitates
Answer: a) The increased stability of complexes with multidentate ligands
40. In the complex [Co(NH3)6]3+, the hybridization of the central cobalt atom is:
a) sp3
b) sp3d
c) sp3d2
d) d2sp3
Answer: d) d2sp3
41. Which of the following is an example of a bidentate ligand?
a) Cl-
b) NH3
c) H2O
d) Oxalate ion
Answer: d) Oxalate ion
42. The oxidation state of manganese in KMnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: d) +7
43. Which of the following is not a postulate of Valence Bond Theory for coordination
compounds?
a) The central metal atom provides empty orbitals for bonding
b) Ligands must have at least one lone pair of electrons
c) The geometry of the complex is always octahedral
d) Hybridization occurs to accommodate the ligands
Answer: c) The geometry of the complex is always octahedral
44. In the naming of coordination compounds, the prefix "hexakis-" indicates:
a) Six identical monodentate ligands
b) Six different monodentate ligands
c) A hexadentate ligand
d) A hexanuclear complex
Answer: a) Six identical monodentate ligands
45. Which of the following is an example of linkage isomerism?
a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
b) cis-[Pt(NH3)2Cl2] and trans-[Pt(NH3)2Cl2]
c) [Co(en)3]Cl3 and [Co(en)2Cl2]Cl
d) [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2·H2O
Answer: a) [Co(NH3)5(NO2)]Cl2 and [Co(NH3)5(ONO)]Cl2
46. The magnetic moment of a high-spin d5 complex in an octahedral field is closest to:
a) 1.73 BM
b) 2.83 BM
c) 3.87 BM
d) 5.92 BM
Answer: d) 5.92 BM
47. Which of the following is not a common application of coordination compounds?
a) Catalysis
b) Metallurgy
c) Medicine
d) Insulation
Answer: d) Insulation
48. The term "ambidentate ligand" refers to:
a) Ligands that can bond through different atoms
b) Ligands that can bond to multiple metal centers
c) Ligands that have multiple charges
d) Ligands that change the coordination number
Answer: a) Ligands that can bond through different atoms
49. In the complex [Ni(CO)4], the oxidation state of nickel is:
a) 0
b) +1
c) +2
d) +4
Answer: a) 0
50. Which of the following is an example of a paramagnetic complex?
a) [Zn(H2O)6]2+
b) [Fe(CN)6]4-
c) [Fe(H2O)6]3+
d) [Ni(CN)4]2-
Answer: c) [Fe(H2O)6]3+
51. The IUPAC name for the complex [Co(en)2Cl2]Cl is:
a) Dichlorobis(ethylenediamine)cobalt(III) chloride
b) Bis(ethylenediamine)dichlorocobalt(III) chloride
c) Chlorobis(ethylenediamine)cobalt(III) dichloride
d) Bis(ethylenediamine)cobalt(III) trichloride
Answer: b) Bis(ethylenediamine)dichlorocobalt(III) chloride
52. Which of the following is not a type of magnetic behavior exhibited by coordination
compounds?
a) Diamagnetism
b) Paramagnetism
c) Ferromagnetism
d) Superparamagnetism
Answer: d) Superparamagnetism
53. The term "labile" in coordination chemistry refers to:
a) Complexes that undergo rapid ligand substitution
b) Complexes that are highly stable
c) Complexes that are highly colored
d) Complexes that are paramagnetic
Answer: a) Complexes that undergo rapid ligand substitution
54. Which of the following is an example of a pi-acid ligand?
a) NH3
b) CO
c) F-
d) H2O
Answer: b) CO
55. The oxidation state of chromium in K2Cr2O7 is:
a) +3
b) +4
c) +5
d) +6
Answer: d) +6
56. Which of the following is not a factor affecting the stability of coordination compounds?
a) Chelate effect
b) Nature of the central metal ion
c) Nature of the ligands
d) Color of the complex
Answer: d) Color of the complex
57. In crystal field theory, which d orbitals are lower in energy in a tetrahedral complex?
a) dxy, dyz, dxz
b) dx2-y2, dz2
c) All d orbitals are equal in energy
d) It depends on the metal
Answer: a) dxy, dyz, dxz
58. The coordination number of the central metal in [Fe(CN)6]3- is:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6
59. Which of the following is an example of a hard acid according to HSAB theory?
a) Cu+
b) Ag+
c) Al3+
d) Hg2+
Answer: c) Al3+
60. The term "denticity" in coordination chemistry refers to:
a) The number of donor atoms in a ligand
b) The charge on the central metal ion
c) The geometry of the complex
d) The oxidation state of the metal
Answer: a) The number of donor atoms in a ligand
61. Which of the following complexes is expected to be diamagnetic?
a) [Fe(H2O)6]2+
b) [Fe(CN)6]4-
c) [Co(H2O)6]2+
d) [Mn(H2O)6]2+
Answer: b) [Fe(CN)6]4-
62. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
63. Which of the following is not a common geometry for 4-coordinate complexes?
a) Tetrahedral
b) Square planar
c) Octahedral
d) See-saw
Answer: c) Octahedral
64. The compound [Pt(NH3)4][PtCl4] exhibits which type of isomerism?
a) Linkage isomerism
b) Coordination isomerism
c) Geometrical isomerism
d) Optical isomerism
Answer: b) Coordination isomerism
65. In the spectrochemical series, which ligand creates the weakest crystal field splitting?
a) I-
b) Br-
c) Cl-
d) F-
Answer: a) I-
66. The oxidation state of iron in K4[Fe(CN)6] is:
a) 0
b) +2
c) +3
d) +4
Answer: b) +2
67. Which of the following is an example of a macrocyclic ligand?
a) EDTA
b) Ethylenediamine
c) Crown ether
d) Oxalate
Answer: c) Crown ether
68. The term "nephelauxetic effect" refers to:
a) The expansion of d orbitals in coordination compounds
b) The contraction of d orbitals in coordination compounds
c) The splitting of d orbitals in coordination compounds
d) The pairing of electrons in d orbitals
Answer: a) The expansion of d orbitals in coordination compounds
69. Which of the following is not a factor affecting the color of coordination compounds?
a) Nature of the metal ion
b) Nature of the ligands
c) Geometry of the complex
d) Molar mass of the complex
Answer: d) Molar mass of the complex
70. The IUPAC name for the complex Na3[Co(NO2)6] is:
a) Sodium hexanitrocobaltate(III)
b) Sodium cobaltinitrite
c) Sodium hexanitritocobaltate(III)
d) Sodium cobalt(III) hexanitrite
Answer: c) Sodium hexanitritocobaltate(III)
71. Which of the following is an example of a soft base according to HSAB theory?
a) F-
b) Cl-
c) I-
d) OH-
Answer: c) I-
72. The term "spectrochemical series" refers to:
a) The order of ligands based on their ability to split d orbitals
b) The order of metals based on their oxidation states
c) The order of complexes based on their stability
d) The order of ligands based on their denticity
Answer: a) The order of ligands based on their ability to split d orbitals
73. In the complex [Co(NH3)4Cl2]+, the coordination number of cobalt is:
a) 4
b) 5
c) 6
d) 7
Answer: c) 6
74. Which of the following is not a type of electronic transition observed in coordination
compounds?
a) d-d transition
b) Charge transfer transition
c) f-f transition
d) s-s transition
Answer: d) s-s transition
75. The oxidation state of manganese in K2MnO4 is:
a) +4
b) +5
c) +6
d) +7
Answer: c) +6
76. Which of the following is an example of a chelating agent used in medicine?
a) EDTA
b) NH3
c) CO
d) CN-
Answer: a) EDTA
77. The term "π-back bonding" is most commonly associated with which type of ligands?
a) Amines
b) Halides
c) Carbon monoxide
d) Water
Answer: c) Carbon monoxide
78. In the crystal field theory, which of the following would result in the largest crystal field
splitting?
a) Weak field ligands
b) Strong field ligands
c) First-row transition metals
d) Low oxidation state metals
Answer: b) Strong field ligands
79. The compound [Co(NH3)5Br]SO4 is an example of:
a) Double salt
b) Coordination compound
c) Simple salt
d) Covalent compound
Answer: b) Coordination compound
80. Which of the following is not a common application of organometallic compounds?
a) Catalysis
b) Fuel additives
c) Semiconductors
d) Building materials
Answer: d) Building materials
81. The hybridization of the central atom in [Ni(CN)4]2- is:
a) sp
b) sp2
c) sp3
d) dsp2
Answer: d) dsp2
82. Which of the following is an example of a metallocene?
a) Ferrocene
b) Cisplatin
c) Wilkinson's catalyst
d) Zeise's salt
Answer: a) Ferrocene
83. The term "high-spin complex" refers to:
a) Complexes with unpaired electrons
b) Complexes with all paired electrons
c) Complexes with high magnetic moments
d) Complexes with low magnetic moments
Answer: a) Complexes with unpaired electrons
