Sample Questions - Chapter 7

CHAPTER 7
Examples of
Multiple Choice Questions

These questions have been taken from exams given in previous years. They roughly cover the material in the order presented in the textbook.
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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 ¹⁶O^2-, 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) S^2-; (b) Ba⁺; (c) Al³⁺; (d) Sb^3-; (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 to Chapter 7

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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