Chemistry questions

 In the Lewis formula that minimizes formal charge, what is the formal charge on the sulfur atom in sulfur trioxide, SO₃?

A) +2

B) +4

C) +6

D) -2

E) 0

12.  In which of the following species is the octet rule violated by the central atom when the central atom has a formal charge of zero?

A) SOCl₂

B) CCl₄

C) H₂S

D) PF₃

E) N₂F₄

13. Which of the following species has the shortest bond distance?

A) NO^-

B) O₂

C) CO

D) F₂

E) Cl₂

14.  The molecular geometry of the ammonium ion, NH₄⁺, is most similar to the molecular geometry of

A) NH₃

B) CH₄

C) N₂H₄

D) NH₂^-

E) CH₃⁺

15.  What is the molecular geometry of the thiosulfate ion, S₂O₃^2–?

A) tetrahedral

B) trigonal bipyramidal

C) pyramidal

D) bent

E) square planar

16.  What is the molecular geometry of the bromate ion, BrO₃^–?

A) square planar

B) trigonal planar

C) square pyramidal

D) tetrahedral

E) trigonal pyramidal

17.  When a carbon atom has sp³ hybridization, it has

A) one π bond and three σ bonds

B) two π bonds and two σ bonds

C) three π bonds and one σ bond

D) four σ bonds

E) four π bonds

18.  What is the bond order of He₂⁺?

A) ½

B) 1½

C) 1

D) 0

E) 2

19.  Which molecule or ion has the shortest bond length?

A) F₂^- 

B) O₂

C) O₂^2-

D) N₂

E) F₂

20.  Which of the following electron distributions among the molecular orbitals best describes the NO molecule?

A) 2, 2, 4, 1, 3, 0

B) 2, 2, 4, 2, 4, 1

C) 2, 2, 4, 2, 1, 0

D) 2, 2, 4, 2, 2, 0

E) 2, 2, 4, 2, 4, 2