Test Bank General Chemistry, 10th edition 1
Chapter 10 – Molecular Geometry and Chemical Bonding Theory
1. Which molecule or ion does not have a trigonal pyramidal molecular geometry?
A)
PO33–
B)
SO32–
C)
NI3
D)
BF3
E)
XeO3
2. What is the electron geometry (or electron arrangement) around an atom in a molecule or
ion which is surrounded by zero lone pairs of electrons and four single bonds.
A)
tetrahedral
B)
trigonal pyramidal
C)
trigonal planar
D)
bent
E)
linear
3. What is the molecular geometry around an atom in a molecule or ion which is surrounded
by zero lone pairs of electrons and four single bonds.
A)
tetrahedral
B)
linear
C)
bent
D)
trigonal pyramidal
E)
trigonal planar
4. What is the molecular geometry around an atom in a molecule or ion which is surrounded
by one lone pair of electrons and four single bonds.
A)
see-saw or distorted tetrahedron
B)
trigonal bipyramidal
C)
linear
D)
T-shaped
E)
trigonal planar
5. What is the electron geometry (or electron arrangement) around an atom in a molecule or
ion which is surrounded by one lone pair of electrons and four single bonds.
A)
trigonal bipyramidal
B)
see-saw or distorted tetrahedron
C)
T-shaped
D)
linear
E)
trigonal planar
6. What is the electron geometry (or electron arrangement) around an atom in a molecule or
ion which is surrounded by one lone pair of electrons and five single bonds.
A)
octahedral
B)
square pyramidal
C)
square planar
D)
bent
E)
linear
7. What is the molecular geometry around an atom in a molecule or ion which is surrounded
by four single bonds and no lone pairs of electrons.
A)
tetrahedral
B)
trigonal bipyramidal
C)
octahedral
D)
linear
E)
trigonal planar
8. What is the molecular geometry around an atom in a molecule or ion which is surrounded
by zero lone pairs of electrons and six single bonds.
A)
octahedral
B)
square planar
C)
square pyramidal
D)
bent
E)
linear
9. Which molecule or ion has a trigonal planar molecular geometry?
A)
PCl3
B)
HCN
C)
CO32–
D)
HCCH
E)
AsF3
10. Which molecule or ion has a trigonal pyramidal molecular geometry?
A)
H2CO
B)
H2CCO
C)
CH3+
D)
CH3–
E)
C2H4
11. Which molecule or ion is not planar?
A)
H2CO
B)
NO2–
C)
C2F4
D)
H2CCO
E)
PO43–
12. Which molecule or ion is not planar?
A)
XeF4
B)
NO3–
C)
BCl3
D)
F2CCF2
E)
CF4
13. Which molecule or ion has a trigonal pyramidal molecular geometry?
A)
BF3
B)
C2H4
C)
SO3
D)
SO32–
E)
CO32–
14. Which molecule or ion has the same molecular geometry for its central atom as the
carbonate ion?
A)
H2CO
B)
AsCl3
C)
PF3
D)
CH3–
E)
BrO3–
15. Which molecule or ion is nonlinear?
A)
CO2
B)
NF2–
C)
OCN–
D)
NO2+
E)
HCCH
Test Bank General Chemistry, 10th edition 5
16. Which molecule or ion is nonlinear?
A)
N2O
B)
O3
C)
OCN–
D)
NO2+
E)
CS2
17. Which molecule or ion is nonlinear?
A)
NO2+
B)
SO2
C)
NNO
D)
CS2
E)
SCN–
18. The approximate CCO angle in acetone, , is
A)
180°.
B)
90°.
C)
109°.
D)
60°.
E)
120°.
19. The approximate H—C—H bond angle in CH3+ is
A)
60°.
B)
90°.
C)
120°.
D)
109°.
E)
180°.
20. The approximate H—C—C bond angle in ethane, C2H6, is
A)
60°.
B)
180°.
C)
120°.
D)
109°.
E)
90°.
21. The molecule AX3, in which A is the central atom, is polar and obeys the octet rule;
therefore,
A)
A has two lone pairs.
B)
A has one lone pair.
C)
A has no lone pairs.
D)
A has four bonding pairs.
E)
A has three lone pairs.
22. What is the predicted H—N—H bond angle in the ammonium ion?
A)
109.5°
B)
90°
C)
180°
D)
120°
E)
45°
23. What is the O—N—O bond angle in the nitrite ion?
A)
90°
B)
180° and 90°
C)
180°
D)
120°
E)
109°
24. What is the bond angle in a linear molecule or ion?
A)
120°
B)
109°
C)
90°
D)
72°
E)
180°
25. For which of the following molecules or ions do the electron pairs on the central nitrogen
atom have a tetrahedral arrangement?
A)
FNO
B)
NF2–
C)
N2F2
D)
NO2–
E)
NO–
26. The molecular geometry of the nitrite ion, NO2– , is best described as
A)
pyramidal.
B)
trigonal pyramidal.
C)
bent.
D)
tetrahedral.
E)
trigonal planar.
27. Which molecule does not have a planar molecular geometry?
A)
SO3
B)
HCCH
C)
N2H4
D)
HNNH
E)
C2F4
Test Bank General Chemistry, 10th edition 8
28. Which molecule or ion does not have a planar molecular geometry?
A)
NO3–
B)
BF3
C)
F2CO
D)
C2H4
E)
SO32–
29. The molecular geometry of the CH3+ ion is best described as
A)
trigonal planar.
B)
pyramidal.
C)
linear.
D)
bent.
E)
tetrahedral.
30. Which of the following concerning electron pair space requirements and bond angles is/are
correct?
1.
Lone pairs of electrons require more space than bonding pairs.
2.
Multiple bonds require the same amount of space as single bonds.
3.
The HOH bond angle in H2O and the HNH bond angle in NH3 are identical
because the electron arrangements (tetrahedral) are identical.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
31. 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+.
32. The molecular geometry of the CH3– ion is
A)
tetrahedral.
B)
square planar.
C)
square pyramidal.
D)
trigonal planar.
E)
trigonal pyramidal.
33. What is the molecular geometry of the thiosulfate ion, S2O32–?
A)
tetrahedral
B)
trigonal bipyramidal
C)
pyramidal
D)
bent
E)
square planar
34. Which molecule or ion does not have a trigonal pyramidal molecular geometry?
A)
AsF3
B)
NF3
C)
PF3
D)
BF3
E)
IO3–
35. Which molecule or ion is not planar?
A)
CO32–
B)
Cl2CCCl2
C)
HNNH
D)
H3O+
E)
F2CO
36. In phosgene, COCl2, the electron groups are located about the central carbon atom in a
______________ arrangement.
A)
square planar
B)
trigonal bipyramidal
C)
pyramidal
D)
trigonal planar
E)
tetrahedral
37. In the hydronium ion, H3O+, the electron groups are arranged about the central oxygen atom
in a
A)
tetrahedron.
B)
square plane.
C)
pyramid.
D)
trigonal plane.
E)
bent structure.
38. What is the C—C—H bond angle in H2CCO?
A)
109°
B)
180°
C)
120°
D)
144°
E)
90°
39. Which molecule or ion has the same molecular geometry as SeO32–?
A)
SeO3
B)
CO32–
C)
NO3–
D)
SO32–
E)
SO3
40. Which molecule or ion has the same molecular geometry for its central atom(s) as BF3?
A)
CF4
B)
CH3–
C)
BF4–
D)
C2F4
E)
C2F6
41. What is the molecular geometry around carbon atom C1?
A)
tetrahedral
B)
trigonal planar
C)
linear
D)
trigonal pyramidal
E)
bent
42. What is the molecular geometry around the nitrogen atom?
A)
trigonal pyramidal
B)
bent
C)
tetrahedral
D)
see-saw or distorted tetrahedral
E)
trigonal planar
43. What is the molecular geometry of the bromate ion, BrO3–?
A)
square planar
B)
trigonal planar
C)
square pyramidal
D)
tetrahedral
E)
trigonal pyramidal
44. Which of the following statements correctly describes the reaction of BF3 with NH3 to form
F3B–NH3?
A)
Both nitrogen and boron change from trigonal planar to tetrahedral geometry
during the reaction.
B)
Boron changes from trigonal planar to tetrahedral geometry during the reaction.
C)
There are no changes in the formal charge on any atom during the reaction.
D)
Nitrogen changes from trigonal planar to tetrahedral geometry during the reaction.
E)
There is no change in geometry around the nitrogen or boron atoms.
45. Which of the following characteristics does not apply to PF3?
A)
has three bonds
B)
contains polar bonds
C)
polar molecule
D)
one lone pair of electrons on phosphorus
E)
trigonal planar
46. What is the H—C—C bond angle in ethylene, H2CCH2?
A)
slightly less than 120°
B)
90°
C)
109°
D)
120°
E)
180°
47. What is the H—O—H bond angle in water?
A)
90°
B)
slightly less than 109°
C)
180°
D)
120°
E)
109°
48. In the ICI4– ion, how many electron groups surround the central iodine atom?
A)
2
B)
4
C)
5
D)
6
E)
3
Test Bank General Chemistry, 10th edition 14
49. In the I3– ion, how many electron groups surround the central atom?
A)
5
B)
3
C)
6
D)
4
E)
2
50. In the ICl4– ion, the electron pairs are arranged around the central iodine atom in the shape
of
A)
a tetrahedron.
B)
an octahedron.
C)
a square plane.
D)
a trigonal bipyramid.
E)
a trigonal pyramid.
51. In ClF3, the electron pairs are arranged about the chlorine atom in
A)
a square plane.
B)
a tetrahedron.
C)
an octahedron.
D)
a trigonal pyramid.
E)
a trigonal bipyramid.
52. What is the molecular geometry of the ICl4– ion?
A)
octahedral
B)
pentagonal
C)
tetrahedral
D)
rectangular
E)
square planar
Test Bank General Chemistry, 10th edition 15
53. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
ClF4–
B)
SiF4
C)
NF4+
D)
CF4
E)
BF4–
54. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
BF4–
B)
NF4+
C)
GeF4
D)
XeF4
E)
BeF42–
55. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
ICl4–
B)
CCl4
C)
GeCl4
D)
BrO4–
E)
SiCl4
56. For which molecule or ion does the nitrogen atom have the positive end of the dipole
moment?
A)
NH4+
B)
CN−
C)
NO
D)
HCN
E)
N2
57. Which of the following molecules is nonpolar?
A)
B)
C)
D)
E)
58. Which molecule is polar?
A)
C2H4
B)
CS2
C)
C6H6
D)
SO2
E)
CF4