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Chemical Bonding

Examples of
Multiple Choice Questions


1.
The valence electrons of representative elements are
(a) in s orbitals only.
(b) located in the outermost occupied major energy level.
(c) located closest to the nucleus.
(d) located in d orbitals.
(e) located in the innermost occupied shell.

2.
Which of the following pairs of elements and valence electrons is incorrect?
(a) Al - 3
(b) Br - 7
(c) S - 4
(d) Sr - 2
(e) Tl - 3

3.
With regard to the species 16O2-, 19F- and 20Ne, which of the following statements is correct?
(a) All three species contain 10 electrons.
(b)The sum of the neutrons in all three species is 27.
(c) The sum of the protons in all three species is 28.
(d) Both 19F- and 20Ne contain 20 neutrons.
(e) none of the above

4.
Which of the following does not have a noble gas electron configuration? (or Which of the following is not isoelectronic with a noble gas?)
(a) S2-
(b) Ba+
(c) Al3+
(d) Sb3-
(e) Sc3+

5.
Which one of the formulas for ionic compounds below is incorrect?
(a) SrCl2
(b) Cs2S
(c) AlCl3
(d) Al3P2
(e) CaSe

6.
Which is classified as nonpolar covalent?
(a) the H-I bond in HI
(b) the H-S bond in H2S
(c) the P-Cl bond in PCl3
(d) the N-Cl bond in NCl3
(e) the N-H bond in NH3

7.
Which one of the compounds below is most likely to be ionic?
(a) GaAs
(b) ScCl3
(c) NO2
(d) CCl4
(e) ClO2

8.
The correct electron-dot formulation for hydrogen cyanide shows:
(a) 2 double bonds and two lone pairs of electrons on the N atom.
(b) 1 C-H bond, 1 C=N bond, 1 lone pair of electrons on the C atom and 1 lone pair of electrons on the N atom.
(c) 1 C-H bond, 1 C-N bond, 2 lone pairs of electrons on the C atom and 3 lone pairs of electrons on the N atom.
(d) 1 triple bond between C and N, 1 N-H bond and 2 lone pairs of electrons on the C atom.
(e) 1 triple bond between C and N, 1 C-H bond and 1 lone pair of electrons on the N atom.

9.
The correct dot formulation for nitrogen trichloride has:
(a) 3 N-Cl bonds and 10 lone pairs of electrons.
(b) 3 N=Cl bonds and 6 lone pairs of electrons.
(c) 1 N-Cl bond, 2 N=Cl bonds and 7 lone pairs of electrons.
(d) 2 N-Cl bonds, 1 N=Cl bond and 8 lone pairs of electrons.
(e) 3 N-Cl bonds and 9 lone pairs of electrons.

10.
What is the total number of electrons in the correct Lewis dot formula of the sulfite ion?
(a) 8
(b) 24
(c) 26
(d) 30
(e) 32

11.
In the Lewis structure for the OF2 molecule, the number of lone pairs of electrons around the central oxygen atom is
(a) 0
(b) 1
(c) 2
(d) 3
(e) 4

12.
The electronic structure of the SO2 molecule is best represented as a resonance hybrid of ____ equivalent structures.
(a) 2
(b) 3
(c) 4
(d) 5
(e) This molecule does not exhibit resonance.

13.
Consider the bicarbonate ion (also called the hydrogen carbonate ion). After drawing the correct Lewis dot structure(s), you would see:
(a) two double bonds around the central carbon atom.
(b) three single bonds around the central carbon atom.
(c) four single bonds around the central carbon atom.
(d) two equivalent resonance forms.
(e) three equivalent resonance forms.

14.
Draw one of the resonance structures of SO3. The formal charge of S is
(a) +2
(b) +1
(c) 0
(d) -1
(e) -2

15.
Which one of the following violates the octet rule?
(a) PCl3
(b) CBr4
(c) NF3
(d) OF2
(e) AsF5


Answers:

1. (b) 2. (c) 3. (a) 4. (b) 5. (d) 6. (d) 7. (b) 8. (e) 9. (a) 10. (c) 11. (c) 12. (a) 13. (d) 14. (a) 15. (e)


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To report any corrections, please e-mail Dr. Wendy Keeney-Kennicutt.