CHEM 1110 Testbank page

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Chem 1110 - Quiz 6C - Fall, 2002

1. What is the electronic geometry of the ion SF42-?

a) see-saw
b) tetrahedral
c) square planar
d) trigonal bipyramidal
e) octahedral

2. What is the molecular geometry of the ion SF42-?

a) see-saw
b) tetrahedral
c) square planar
d) trigonal bipyramidal
e) octahedral

3. What is the valence bond hybridization on the central atom in PCl3?

a) dsp3
b) sp3
c) d2sp3
d) sp2
e) sp

4. Work out the Lewis dot structure for the cyanate ion, OCN-. Which of the following species does its Lewis structure most closely resemble?

a) CO2
b) O3
c) SO2
d) ClO2

5. Which of the following is INCORRECTLY classified?

a) HF - polar covalent bond and polar molecule
b) F2 - nonpolar covalent bond and nonpolar molecule
c) NaF - ionic bond and ionic compound
d) CF4 - polar covalent bonds but nonpolar molecule
e) PCl5 - polar covalent bonds and polar molecule

6. Which of the following common molecules possesses a net (overall) dipole moment?

a) NH3
b) CO2
c) CH4
d) N2
e) O2

7. In which of the species below would one predict resonance?

a) PH3
b) CS2
c) NO2-1
d) SO43-

8. Which of the following best describes covalent bonding? (EN = electronegativity)

a) Bonding between elements with very different EN, and with transfer of electrons.
b) Bonding between elements with similar EN, and with transfer of electrons.
c) Bonding between elements with very different EN, and with sharing of electrons.
d) Bonding between elements with similar EN, and sharing of electrons.

9. For the molecule HOBr, hypobromous acid, the formal charges of H, O, and Br, respectively, are:

a) +2, -1, -2
b) -1, 0, +1
c) 0, 0, -1
d) -1, 0, 0
e) 0, 0, 0

10. All of the following have Lewis structures that obey the octet rule except:

a) ClO2
b) HOCl
c) ClO2-
d) ClO4-

11. Which of the following is a radical?

a) CO
b) NO2-
c) NO
d) OCl-

12 The number of lone pairs around Xe in XeO2 is:

a) 0
b) 2
c) 4
d) 1

13. The number of valence electrons in H2CO3 is:

a) 24
b) 26
c) 22
d) 32
e) 16

14. Which is the most correct definition of a Lewis base?

a) a proton donor
b) an electron pair acceptor
c) an electron pair donor
d) a species that has an OH- ion
e) none are correct

15. Which of the following is a Lewis acid?

a) CN-
b) Al3+
c) Cl-
d) PCl3


KEY

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