1. Which element will have five electrons in its Lewis symbol?

a. argon

b. boron

c. carbon

d. phosphorus

e. sulfur

2. Which of the following statements could not describe a covalent bonds?

a. The sharing of two electrons between two atoms

b. The sharing of four electrons between two atoms

c. An electrostatic interaction between two oppositely charged ions

d. The sharing of two or more electrons equally between two atoms

e. The sharing of two or more electrons unequally between two atoms

3. Which molecule does not contain a double bond?

a. CO2

b. CH2O

c O2

d HCOOH

e HCN

4. Which bond is least polar?

a. C-C

b. C-N

c. N-H

d. C-F

e. C-O

5. Which element is the most electronegative?

a. sulfur

b. iodine

c. nitrogen

d. aluminum

e. carbon

6. What is the formal charge on carbon in HCN?

a. -2

b. -1

c. 0

d. +1

e. +2

7. How many resonance forms will ozone, O3 have?

a. -1

b. 0

c. 1

d. 2

e. 3

8. A list of non-metals is given below. Which elements cannot exceed the octet rule?

B Si N P O S F Cl

a. Si, P, S, Cl

b. B, N, O, F

c. O, S, F, Cl

d. B, Si, N, P

e. All eight elements can exceed the octet rule.

9. Use VSEPR Theory to predict the X-A-X angles for the following compounds:

CO2, GeF4, BCl3

a. 109.5°, 109.5°, 109.5°

b. 109.5°, 90°, 90°

c. 109.5°, 90°, 109.5°

d. 180°, 109.5°, 120°

e. 180°, 90°, 120°

10. Use VSEPR Theory to predict the electron-pair geometry and bond angles of PF4+.

a. octahedral, 90°

b. square planar, 90°

c. tetrahedral, 109.5°

d. triangular pyramidal, 90°

e. tetrahedral, 90°