Test Bank Molecular - Chemistry for engineers | Trường Đại học Quốc tế, Đại học Quốc gia Thành phố HCM

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48 24 lượt tải Tải xuống
Chia sẻ Báo cáo tài liệu

Môn: Chemistry for engineers (CH011IU)

Trường: Trường Đại học Quốc tế, Đại học Quốc gia Thành phố Hồ Chí Minh

Thông tin:

30 trang 5 tháng trước

Tác giả:

Profile Mai Nguyệt
1. Which molecule or ion does not have a trigonal pyramidal molecular geometry?
A)
PO
3
3
–
B)
SO
3
2
–
C)
NI
3
D)
BF
3
E)
XeO
3
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-4 electron pairs
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-4 electron pairs
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-5 electron pairs
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-5 electron pairs
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-6 electron pairs
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-2-6 bonding pair
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-6 electron pairs
TOP: bonding | molecular geometry
9. Which molecule or ion has a trigonal planar molecular geometry?
A)
PCl
3
B)
HCN
C)
CO
3
2
–
D)
HCCH
E)
AsF
3
ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
10. Which molecule or ion has a trigonal pyramidal molecular geometry?
A)
H
2
CO
B)
H
2
CCO
C)
CH
3
+
D)
CH
3
–
E)
C
2
H
4
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
11. Which molecule or ion is not planar?
A)
H
2
CO
B)
NO
2
–
C)
C
2
F
4
D)
H
2
CCO
E)
PO
4
3
–
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
12. Which molecule or ion is not planar?
A)
XeF
4
B)
NO
3
–
C)
BCl
3
D)
F
2
CCF
2
E)
CF
4
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
13. Which molecule or ion has a trigonal pyramidal molecular geometry?
A)
BF
3
B)
C
2
H
4
C)
SO
3
D)
SO
3
2
–
E)
CO
3
2
–
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
14. Which molecule or ion has the same molecular geometry for its central atom as the
carbonate ion?
A)
H
2
CO
B)
AsCl
3
C)
PF
3
D)
CH
3
–
E)
BrO
3
–
ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
15. Which molecule or ion is nonlinear?
A)
CO
2
B)
NF
2
–
C)
OCN
–
D)
NO
2
+
E)
HCCH
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
16. Which molecule or ion is nonlinear?
A)
N
2
O
B) O
3
C) OCN
–
D)
NO
2
+
E) CS
2
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
17. Which molecule or ion is nonlinear?
A)
NO
2
+
B)
SO
2
C)
NNO
D)
CS
2
E)
SCN
–
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
18. The approximate CCO angle in acetone, , is
A)
180°.
B) 90°.
C) 109°.
D)
60°.
E) 120°.
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
19. The approximate H—C—H bond angle in CH
3
+
is
A)
60°.
B)
90°.
C)
120°.
D)
109°.
E)
180°.
ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
20. The approximate H—C—C bond angle in ethane, C
2
H
6
, is
A)
60°.
B)
180°.
C)
120°.
D)
109°.
E)
90°.
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
21. The molecule AX
3
, 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.
ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
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°
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
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°
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
24. What is the bond angle in a linear molecule or ion?
A)
120°
B)
109°
C)
90°
D)
72°
E)
180°
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
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)
NF
2
–
C)
N
2
F
2
D)
NO
2
–
E)
NO
–
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
26. The molecular geometry of the nitrite ion, NO
2
–
,
is best described as
A)
pyramidal.
B)
trigonal pyramidal.
C)
bent.
D)
tetrahedral.
E)
trigonal planar.
ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
27. Which molecule does not have a planar molecular geometry?
A)
SO
3
B)
HCCH
C)
N
2
H
4
D)
HNNH
E)
C
2
F
4
ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
28. Which molecule or ion does not have a planar molecular geometry?
A)
NO
3
–
B)
BF
3
C)
F
2
CO
D)
C
2
H
4
E)
SO
3
2
–
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
29. The molecular geometry of the CH
3
+
ion is best described as
A)
trigonal planar.
B)
pyramidal.
C)
linear.
D)
bent.
E)
tetrahedral.
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
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 H
2
O and the HNH bond angle in NH
3
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
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Space Requirements-VESPR TOP: bonding | molecular geometry
31. The molecular geometry of the ammonium ion, NH
4
+
, is most similar to the molecular
geometry of
A)
NH
3
.
B)
CH
4
.
C)
N
2
H
4
.
D)
NH
2
–
.
E)
CH
3
+
.
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
32. The molecular geometry of the CH
3
–
ion is
A)
tetrahedral.
B)
square planar.
C)
square pyramidal.
D)
trigonal planar.
E)
trigonal pyramidal.
ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
33. What is the molecular geometry of the thiosulfate ion, S
2
O
3
2–
?
A)
tetrahedral
B)
trigonal bipyramidal
C)
pyramidal
D)
bent
E)
square planar
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
34. Which molecule or ion does not have a trigonal pyramidal molecular geometry?
A)
AsF
3
B)
NF
3
C)
PF
3
D)
BF
3
E)
IO
3
–
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
35. Which molecule or ion is not planar?
A)
CO
3
2
–
B)
Cl
2
CCCl
2
C)
HNNH
D)
H
3
O
+
E)
F
2
CO
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
36. In phosgene, COCl
2
, 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
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
37. In the hydronium ion, H
3
O
+
, 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.
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
38. What is the C—C—H bond angle in H
2
CCO?
A)
109°
B)
180°
C)
120°
D)
144°
E)
90°
ANS: C PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
39. Which molecule or ion has the same molecular geometry as SeO
3
2–
?
A)
SeO
3
B)
CO
3
2
–
C)
NO
3
–
D)
SO
3
2
–
E)
SO
3
ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
40. Which molecule or ion has the same molecular geometry for its central atom(s) as BF
3
?
A)
CF
4
B) CH
3
–
C) BF
4
–
D)
C
2
F
4
E) C
2
F
6
ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement
MSC: general chemistry
41. What is the molecular geometry around carbon atom C
1
?
A)
tetrahedral
B) trigonal planar
C) linear
D)
trigonal pyramidal
E) bent
ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry in a molecule.
TOP: bonding | molecular geometry
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
ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry in a molecule.
TOP: bonding | molecular geometry
43. What is the molecular geometry of the bromate ion, BrO
3
–
?
A)
square planar
B)
trigonal planar
C)
square pyramidal
D)
tetrahedral
E)
trigonal pyramidal
ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
44. Which of the following statements correctly describes the reaction of BF
3
with NH
3
to form
F
3
B–NH
3
?
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.
ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
45. Which of the following characteristics does not apply to PF
3
?
A)
has three bonds
B)
contains polar bonds
C)
polar molecule
D)
one lone pair of electrons on phosphorus
E)
trigonal planar
ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement
MSC: general chemistry
46. What is the H—C—C bond angle in ethylene, H
2
CCH
2
?
A)
slightly less than 120°
B)
90°
C)
109°
D)
120°
E)
180°
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Note that a lone pair tends to require more space than a corresponding bonding pair
and that a multiple bond requires more space than a single bond.
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
47. What is the H—O—H bond angle in water?
A)
90°
B)
slightly less than 109°
C)
180°
D)
120°
E)
109°
ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Note that a lone pair tends to require more space than a corresponding bonding pair
and that a multiple bond requires more space than a single bond.
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
48. In the ICI
4
–
ion, how many electron groups surround the central iodine atom?
A)
2
B)
4
C)
5
D)
6
E)
3
ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement
MSC: general chemistry
49. In the I
3
–
ion, how many electron groups surround the central atom?
A)
5
B)
3
C)
6
D)
4
E)
2
ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal bipyramidal arrangement
MSC: general chemistry
50. In the ICl
4
–
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.
ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement
MSC: general chemistry
51. In ClF
3
, 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.
ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal bipyramidal arrangement
MSC: general chemistry
52. What is the molecular geometry of the ICl
4
–
ion?
A)
octahedral
B)
pentagonal
C)
tetrahedral
D)
rectangular
E)
square planar
ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement
MSC: general chemistry
53. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
ClF
4
–
B)
SiF
4
C)
NF
4
+
D)
CF
4
E)
BF
4
–
ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
54. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
BF
4
–
B)
NF
4
+
C)
GeF
4
D)
XeF
4
E)
BeF
4
2
–
ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
55. Which molecule or ion does not have a tetrahedral molecular geometry?
A)
ICl
4
–
B)
CCl
4
C)
GeCl
4
D)
BrO
4
–
E)
SiCl
4
ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
56. For which molecule or ion does the nitrogen atom have the positive end of the dipole
moment?
A)
NH
4
+
B)
CN
C) NO
D)
HCN
E) N
2
ANS: C PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
57. Which of the following molecules is nonpolar?
A)
B)
C)
D)
E)
ANS: E PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
58. Which molecule is polar?
A)
C
2
H
4
B)
CS
2
C)
C
6
H
6
D)
SO
2
E)
CF
4
ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
59. Which of the following concerning molecular geometry and dipole moments is/are correct?
1. Only molecules with polar bonds may have a permanent dipole moment.
2. All molecules with polar bonds have a permanent dipole moment.
3. All square planar molecules are nonpolar.
A)
1 only
B) 2 only
C) 3 only
D)
1 and 3
E) 1, 2, and 3
ANS: A PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
60. Which of the following molecules has a permanent dipole moment?
A)
SF
6
B) CCl
4
C) NF
3
D)
SiCl
4
E) BF
3
ANS: C PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
61. Which of the following molecules does not have a permanent dipole moment?
A)
sulfur tetrafluoride, SF
4
B) iodine trichloride, ICl
3
C) nitrogen trifluoride, NF
3
D)
phosphorus pentafluoride, PF
5
E) sulfur dioxide, SO
2
ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
62. Which of the following molecules has a dipole moment?
A)
PF
5
B)
FOOF
C)
HCCH
D)
F
2
CCF
2
E)
SF
6
ANS: B PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
63. Which of the following molecules has a dipole moment?
A)
SO
2
B)
CS
2
C)
ClCCCCCl
D)
CCl
4
E)
HCCH
ANS: A PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
64. Which of the following compounds is nonpolar?
A)
H
2
S
B)
XeF
2
C)
SO
2
D)
N
2
O
E)
HCl
ANS: B PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
65. Which of the following molecules is polar?
A)
SF
6
B)
CCl
4
C)
BF
3
D)
NO
2
E)
CO
2
ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
66. Which of the following statements best describes N
2
O?
A)
The molecular geometry is bent and the molecule is nonpolar.
B)
The molecular geometry is linear and the molecule is nonpolar.
C)
The molecular geometry is linear and the molecule is polar.
D)
The molecular geometry is trigonal planar and the molecule is nonpolar.
E)
The molecular geometry is bent and the molecule is polar.
ANS: C PTS: 1 DIF: moderate REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
67. Which of the following molecules is nonpolar?
A)
SF
4
B)
PF
5
C)
ClF
3
D)
PF
3
E)
CH
2
F
2
ANS: B PTS: 1 DIF: moderate REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
68. Which one of the following statements provides the best evidence that all the carbon
compounds listed below have tetrahedral molecular geometries instead of square planar
molecular geometries?
A)
Only one CH
4
compound is known and it is nonpolar.
B)
Only one CH
3
F compound is known and it is polar.
C)
Only one CH
2
F
2
compound is known and it is polar.
D)
Only one CF
4
compound is known and it is nonpolar.
E)
Only one CHF
3
compound is known and it is polar.
ANS: C PTS: 1 DIF: difficult REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example
10.3) TOP: bonding | molecular geometry
KEY: dipole moment MSC: general chemistry
69. When an atom in a molecule or ion is described as sp
3
d
2
hybridized, its molecular geometry
is
A)
octahedral.
B) trigonal bipyramidal.
C) linear.
D)
tetrahedral.
E) trigonal planar.
ANS: A PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories
70. How many sigma and pi bonds are in the molecule pictured below?
A)
thirteen sigma bonds and one pi bond
B) eleven sigma bonds and two pi bonds
C) thirteen sigma bonds and two pi bonds
D)
eleven sigma bonds and five pi bonds
E) five sigma bonds and eleven pi bonds
ANS: A PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories
71. What hybrid orbitals of sulfur are involved in the bonding in sulfur trioxide?
A)
sp
2
B) sp
2
d
C) sp
3
D)
sp
3
d
2
E) sp
ANS: A PTS: 1 DIF: moderate REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
72. Which of the following statements is incorrect regarding the water molecule?
A)
There are two lone pairs and two bonding pairs on the central atom.
B)
The molecule is polar.
C)
The hybridization of oxygen is sp
3
.
D)
The hybridization of hydrogen is sp.
E)
The molecular geometry is bent.
ANS: D PTS: 1 DIF: moderate REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
73. What is the hybridization of Se in SeF
6
?
A)
sp
3
d
B) sp
3
d
2
C) sp
2
D)
sp
E) sp
3
ANS: B PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
74. What is the hybridization of Br in BrF
3
?
A)
sp
3
B) sp
C) sp
3
d
2
D)
sp
2
E) sp
3
d
ANS: E PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
75. What is the hybridization of I in IF
4
–
?
A)
sp
2
B) sp
C) sp
3
d
D)
sp
3
d
2
E) sp
3
ANS: D PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
76. According to valence-bond theory, what is the hybridization scheme of the sulfur atom in
SF
4
?
A)
B)
C)
D)
E)
ANS: C PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization
MSC: general chemistry
77. A bond is the result of the
A)
overlap of two s orbitals.
B)
overlap of two p orbitals along their axes.
C)
sideways overlap of two parallel p orbitals.
D)
overlap of an s orbital and a p orbital.
E)
sideways overlap of two s orbitals.
ANS: C PTS: 1 DIF: easy REF: 10.4
OBJ: Define pi bond. TOP: bonding | bonding theories
KEY: multiple bonding MSC: general chemistry
78. Which of the following statements is true?
A)
A bond is twice as strong as a single bond.
B)
A bond results from the sideways overlap of hybridized orbitals.
C)
A double bond consists of a bond and a bond.
D)
A bond has cylindrical symmetry about the bonding axis.
E)
A bond is twice as strong as a bond.
ANS: C PTS: 1 DIF: moderate REF: 10.4
OBJ: Define pi bond. TOP: bonding | bonding theories
KEY: multiple bonding MSC: general chemistry
79. Which of the labeled carbons (C
1
-C
4
) is/are sp
3
-hybridized?
A)
carbon two and four
B) carbon three
C) carbon one
D)
carbon two
E) carbon one and three
ANS: A PTS: 1 DIF: easy REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories
80. What is the hybridization of the nitrogen atom in the nitrite ion?
A)
sp
3
d
B)
sp
3
C)
s
D)
sp
E)
sp
2
ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding
MSC: general chemistry
81. According to valence-bond theory, the bonding in ketene, H
2
CCO, is best described as
A)
five bonds.
B)
three bonds and two bonds.
C)
four bonds and two bonds.
D)
four bonds and one bond.
E)
five bonds.
ANS: C PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding
MSC: general chemistry
82. Which of the following concerning and bonds is/are correct?
1. Sigma bonds may only be formed from unhybridized orbitals.
2. Pi bonds are formed from unhybridized p orbitals.
3. A pi bond has an electron distribution above and below the bond axis.
A)
1 only
B) 2 only
C) 3 only
D)
1 and 2
E) 2 and 3
ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories NOT: REVISED
83. Which of the following concerning and bonds is/are correct?
1. A sigma bond may be formed from the sideways overlap of two parallel p
orbitals.
2. No more than two pi bonds are possible between adjacent carbon atoms.
3. The considerable energy required to rotate pi bonded atoms is the primary
reason for geometrical isomerism in some pi bonded molecules.
A)
1 only
B) 2 only
C) 3 only
D)
1 and 2
E) 2 and 3
ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories
84. Which molecule or ion does not contain two bonds?
A)
HCCH
B)
H
2
CCCH
2
C)
NO
–
D)
CS
2
E)
SCN
–
ANS: C PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding
MSC: general chemistry
85. If four orbitals on one atom overlap four orbitals on a second atom, how many molecular
orbitals will form?
A)
4
B)
16
C)
1
D)
8
E)
none of these
ANS: D PTS: 1 DIF: moderate REF: 10.5
OBJ: Define molecular orbital theory. TOP: bonding | bonding theories
KEY: molecular orbital theory MSC: general chemistry
86. Which of the following statements is/are true?
1. Electrons are never found in an antibonding molecular orbital.
2. Antibonding molecular orbitals have electron density mainly outside the space
between the two nuclei.
3. All antibonding molecular orbitals are higher in energy than the atomic
orbitals of which they are composed.
A)
1 only
B) 2 only
C) 3 only
D)
1 and 2
E) 2 and 3
ANS: E PTS: 1 DIF: moderate REF: 10.5
OBJ: Define bonding orbitals and antibonding orbitals.
TOP: bonding | bonding theories KEY: molecular orbital theory
MSC: general chemistry
87. The nitrosyl ion, NO
+
, has ten bonding electrons and four antibonding electrons. Therefore,
it has a bond order of
A)
1.
B)
5/2.
C)
7.
D)
2.
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1. Which molecule or ion does not have a trigonal pyramidal molecular geometry? A) PO 3– 3 B) SO 2– 3 C) NI3 D) BF3 E) XeO3 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-4 electron pairs
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-4 electron pairs
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-5 electron pairs
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-5 electron pairs
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Electron Geometry-6 electron pairs
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-2-6 bonding pair
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Molecular Geometry-6 electron pairs
TOP: bonding | molecular geometry
9. Which molecule or ion has a trigonal planar molecular geometry? A) PCl3 B) HCN C) CO 2– 3 D) HCCH E) AsF3 ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
10. Which molecule or ion has a trigonal pyramidal molecular geometry? A) H2CO B) H2CCO C) CH + 3 D) CH – 3 E) C 2H4 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
11. Which molecule or ion is not planar? A) H2CO B) NO – 2 C) C 2F4 D) H2CCO E) PO 3– 4 ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
12. Which molecule or ion is not planar? A) XeF4 B) NO – 3 C) BCl3 D) F2CCF2 E) CF4 ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
13. Which molecule or ion has a trigonal pyramidal molecular geometry? A) BF3 B) C 2H4 C) SO3 D) SO 2– 3 E) CO 2– 3 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
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) CH – 3 E) BrO – 3 ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
15. Which molecule or ion is nonlinear? A) CO2 B) NF – 2 C) OCN– D) NO + 2 E) HCCH ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
16. Which molecule or ion is nonlinear? A) N2O B) O3 C) OCN– D) NO + 2 E) CS2 ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
17. Which molecule or ion is nonlinear? A) NO + 2 B) SO2 C) NNO D) CS2 E) SCN– ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
18. The approximate CCO angle in acetone, , is A) 180°. B) 90°. C) 109°. D) 60°. E) 120°. ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
19. The approximate H—C—H bond angle in CH + 3 is A) 60°. B) 90°. C) 120°. D) 109°. E ) 180°. ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
20. The approximate H—C—C bond angle in ethane, C2H6, is A) 60°. B) 180°. C) 120°. D) 109°. E) 90°. ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
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. ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
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° ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
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° ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
24. What is the bond angle in a linear molecule or ion? A) 120° B) 109° C) 90° D) 72° E ) 180° ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
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) NF – 2 C) N2F2 D) NO – 2 E) NO– ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
26. The molecular geometry of the nitrite ion, NO – 2 , is best described as A) pyramidal. B) trigonal pyramidal. C) bent. D) tetrahedral. E) trigonal planar. ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
27. Which molecule does not have a planar molecular geometry? A) SO3 B) HCCH C) N2H4 D) HNNH E) C 2F4 ANS: C PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
28. Which molecule or ion does not have a planar molecular geometry? A) NO – 3 B) BF3 C) F2CO D) C 2H4 E) SO 2– 3 ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
29. The molecular geometry of the CH + 3 ion is best described as A) trigonal planar. B) pyramidal. C) linear. D) bent. E) tetrahedral. ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
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 ANS: A PTS: 1 DIF: easy REF: 10.1 OBJ: Space Requirements-VESPR
TOP: bonding | molecular geometry
31. The molecular geometry of the ammonium ion, NH +
4 , is most similar to the molecular geometry of A) NH3. B) CH4. C) N2H4. D) NH – 2 . E) CH + 3 . ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
32. The molecular geometry of the CH – 3 ion is A) tetrahedral. B) square planar. C) square pyramidal. D) trigonal planar. E) trigonal pyramidal. ANS: E PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
33. What is the molecular geometry of the thiosulfate ion, S 2– 2O3 ? A) tetrahedral B) trigonal bipyramidal C) pyramidal D) bent E) square planar ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
34. Which molecule or ion does not have a trigonal pyramidal molecular geometry? A) AsF3 B) NF3 C) PF3 D) BF3 E) IO – 3 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
35. Which molecule or ion is not planar? A) CO 2– 3 B) Cl2CCCl2 C) HNNH D) H3O+ E) F2CO ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
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 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
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. ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
38. What is the C—C—H bond angle in H2CCO? A) 109° B) 180° C) 120° D) 144° E) 90° ANS: C PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
39. Which molecule or ion has the same molecular geometry as SeO 2– 3 ? A) SeO3 B) CO 2– 3 C) NO – 3 D) SO 2– 3 E) SO3 ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
40. Which molecule or ion has the same molecular geometry for its central atom(s) as BF3? A) CF4 B) CH – 3 C) BF – 4 D) C 2F4 E ) C2F6 ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal planar arrangement MSC: general chemistry
41. What is the molecular geometry around carbon atom C1? A) tetrahedral B) trigonal planar C) linear D) trigonal pyramidal E) bent ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry in a molecule.
TOP: bonding | molecular geometry
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 ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry in a molecule.
TOP: bonding | molecular geometry
43. What is the molecular geometry of the bromate ion, BrO – 3 ? A) square planar B) trigonal planar C) square pyramidal D) tetrahedral E) trigonal pyramidal ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
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. ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
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 ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (two, three, or four electron pairs). (Example 10.1)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | tetrahedral arrangement MSC: general chemistry
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° ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Note that a lone pair tends to require more space than a corresponding bonding pair
and that a multiple bond requires more space than a single bond.
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry
47. What is the H—O—H bond angle in water? A) 90° B) slightly less than 109° C) 180° D) 120° E ) 109° ANS: B PTS: 1 DIF: easy REF: 10.1
OBJ: Note that a lone pair tends to require more space than a corresponding bonding pair
and that a multiple bond requires more space than a single bond.
TOP: bonding | molecular geometry KEY: bond angle MSC: general chemistry 48. In the ICI –
4 ion, how many electron groups surround the central iodine atom? A) 2 B) 4 C) 5 D) 6 E) 3 ANS: D PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement MSC: general chemistry 49. In the I –
3 ion, how many electron groups surround the central atom? A) 5 B) 3 C) 6 D) 4 E ) 2 ANS: A PTS: 1 DIF: easy REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal bipyramidal arrangement MSC: general chemistry 50. In the ICl –
4 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. ANS: B PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement MSC: general chemistry
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. ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | trigonal bipyramidal arrangement MSC: general chemistry
52. What is the molecular geometry of the ICl – 4 ion? A) octahedral B) pentagonal C) tetrahedral D) rectangular E) square planar ANS: E PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model | octahedral arrangement MSC: general chemistry
53. Which molecule or ion does not have a tetrahedral molecular geometry? A) ClF – 4 B) SiF4 C) NF + 4 D) CF4 E) BF – 4 ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
54. Which molecule or ion does not have a tetrahedral molecular geometry? A) BF – 4 B) NF + 4 C) GeF4 D) XeF4 E) BeF 2– 4 ANS: D PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
55. Which molecule or ion does not have a tetrahedral molecular geometry? A) ICl – 4 B) CCl4 C) GeCl4 D) BrO – 4 E) SiCl4 ANS: A PTS: 1 DIF: moderate REF: 10.1
OBJ: Predict the molecular geometry (five or six electron pairs). (Example 10.2)
TOP: bonding | molecular geometry
KEY: the valence-shell electron-pair repulsion model MSC: general chemistry
56. For which molecule or ion does the nitrogen atom have the positive end of the dipole moment? A) NH + 4 B) CN C) NO D) HCN E) N2 ANS: C PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
57. Which of the following molecules is nonpolar? A) B) C) D) E) ANS: E PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry 58. Which molecule is polar? A) C 2H4 B) CS2 C) C 6H6 D) SO2 E) CF4 ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
59. Which of the following concerning molecular geometry and dipole moments is/are correct?
1. Only molecules with polar bonds may have a permanent dipole moment.
2. All molecules with polar bonds have a permanent dipole moment.
3. All square planar molecules are nonpolar. A) 1 only B) 2 only C) 3 only D) 1 and 3 E) 1, 2, and 3 ANS: A PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry
60. Which of the following molecules has a permanent dipole moment? A) SF6 B) CCl4 C) NF3 D) SiCl4 E) BF3 ANS: C PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
61. Which of the following molecules does not have a permanent dipole moment? A) sulfur tetrafluoride, SF4 B) iodine trichloride, ICl3 C) nitrogen trifluoride, NF3
D) phosphorus pentafluoride, PF5 E) sulfur dioxide, SO2 ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry
62. Which of the following molecules has a dipole moment? A) PF5 B) FOOF C) HCCH D) F2CCF2 E) SF6 ANS: B PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
63. Which of the following molecules has a dipole moment? A) SO2 B) CS2 C) ClCCCCCl D) CCl4 E) HCCH ANS: A PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
64. Which of the following compounds is nonpolar? A) H2S B) XeF2 C) SO2 D) N2O E) HCl ANS: B PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
65. Which of the following molecules is polar? A) SF6 B) CCl4 C) BF3 D) NO2 E) CO2 ANS: D PTS: 1 DIF: easy REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
66. Which of the following statements best describes N2O?
A) The molecular geometry is bent and the molecule is nonpolar.
B) The molecular geometry is linear and the molecule is nonpolar.
C) The molecular geometry is linear and the molecule is polar.
D) The molecular geometry is trigonal planar and the molecule is nonpolar.
E) The molecular geometry is bent and the molecule is polar. ANS: C PTS: 1 DIF: moderate REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
67. Which of the following molecules is nonpolar? A) SF4 B) PF5 C) ClF3 D) PF3 E) CH2F2 ANS: B PTS: 1 DIF: moderate REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
68. Which one of the following statements provides the best evidence that all the carbon
compounds listed below have tetrahedral molecular geometries instead of square planar molecular geometries?
A) Only one CH4 compound is known and it is nonpolar.
B) Only one CH3F compound is known and it is polar.
C) Only one CH2F2 compound is known and it is polar.
D) Only one CF4 compound is known and it is nonpolar.
E) Only one CHF3 compound is known and it is polar. ANS: C PTS: 1 DIF: difficult REF: 10.2
OBJ: Explain the relationship between dipole moment and molecular geometry. (Example 10.3) TOP: bonding | molecular geometry KEY: dipole moment MSC: general chemistry
69. When an atom in a molecule or ion is described as sp3d2 hybridized, its molecular geometry is A) octahedral. B) trigonal bipyramidal. C) linear. D) tetrahedral. E) trigonal planar. ANS: A PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories
70. How many sigma and pi bonds are in the molecule pictured below?
A) thirteen sigma bonds and one pi bond
B) eleven sigma bonds and two pi bonds
C) thirteen sigma bonds and two pi bonds
D) eleven sigma bonds and five pi bonds
E) five sigma bonds and eleven pi bonds ANS: A PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories
71. What hybrid orbitals of sulfur are involved in the bonding in sulfur trioxide? A) sp2 B) sp2d C) sp3 D) sp3d2 E) sp ANS: A PTS: 1 DIF: moderate REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
72. Which of the following statements is incorrect regarding the water molecule?
A) There are two lone pairs and two bonding pairs on the central atom. B) The molecule is polar.
C) The hybridization of oxygen is sp3.
D) The hybridization of hydrogen is sp.
E) The molecular geometry is bent. ANS: D PTS: 1 DIF: moderate REF: 10.3
OBJ: Apply valence bond theory (two, three, or four electron pairs). (Example 10.4)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
73. What is the hybridization of Se in SeF6? A) sp3d B) sp3d2 C) sp2 D) sp E) sp3 ANS: B PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
74. What is the hybridization of Br in BrF3? A) sp3 B) sp C) sp3d2 D) sp2 E) sp3d ANS: E PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
75. What is the hybridization of I in IF – 4 ? A) sp2 B) sp C) sp3d D) sp3d2 E) sp3 ANS: D PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
76. According to valence-bond theory, what is the hybridization scheme of the sulfur atom in SF4? A) B) C) D) E) ANS: C PTS: 1 DIF: easy REF: 10.3
OBJ: Apply valence bond theory (five or six electron pairs). (Example 10.5)
TOP: bonding | bonding theories KEY: hybridization MSC: general chemistry
77. A bond is the result of the A) overlap of two s orbitals.
B) overlap of two p orbitals along their axes.
C) sideways overlap of two parallel p orbitals.
D) overlap of an s orbital and a p orbital.
E) sideways overlap of two s orbitals. ANS: C PTS: 1 DIF: easy REF: 10.4 OBJ: Define pi bond.
TOP: bonding | bonding theories KEY: multiple bonding MSC: general chemistry
78. Which of the following statements is true?
A) A bond is twice as strong as a single bond.
B) A bond results from the sideways overlap of hybridized orbitals.
C) A double bond consists of a bond and a bond.
D) A bond has cylindrical symmetry about the bonding axis.
E) A bond is twice as strong as a bond. ANS: C PTS: 1 DIF: moderate REF: 10.4 OBJ: Define pi bond.
TOP: bonding | bonding theories KEY: multiple bonding MSC: general chemistry
79. Which of the labeled carbons (C1-C4) is/are sp3-hybridized? A) carbon two and four B) carbon three C) carbon one D) carbon two E) carbon one and three ANS: A PTS: 1 DIF: easy REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories
80. What is the hybridization of the nitrogen atom in the nitrite ion? A) sp3d B) sp3 C) s D) sp E) sp2 ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding MSC: general chemistry
81. According to valence-bond theory, the bonding in ketene, H2CCO, is best described as A) five bonds. B) three bonds and two bonds. C) four bonds and two bonds. D) four bonds and one bond. E) five bonds. ANS: C PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding MSC: general chemistry
82. Which of the following concerning and bonds is/are correct?
1. Sigma bonds may only be formed from unhybridized orbitals.
2. Pi bonds are formed from unhybridized p orbitals.
3. A pi bond has an electron distribution above and below the bond axis. A) 1 only B) 2 only C) 3 only D) 1 and 2 E ) 2 and 3 ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories NOT: REVISED
83. Which of the following concerning and bonds is/are correct?
1. A sigma bond may be formed from the sideways overlap of two parallel p orbitals.
2. No more than two pi bonds are possible between adjacent carbon atoms.
3. The considerable energy required to rotate pi bonded atoms is the primary
reason for geometrical isomerism in some pi bonded molecules. A) 1 only B) 2 only C) 3 only D) 1 and 2 E ) 2 and 3 ANS: E PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories
84. Which molecule or ion does not contain two bonds? A) HCCH B) H2CCCH2 C) NO– D) CS2 E) SCN– ANS: C PTS: 1 DIF: moderate REF: 10.4
OBJ: Apply valence bond theory (multiple bonding). (Example 10.6)
TOP: bonding | bonding theories KEY: multiple bonding MSC: general chemistry
85. If four orbitals on one atom overlap four orbitals on a second atom, how many molecular orbitals will form? A) 4 B) 16 C) 1 D) 8 E) none of these ANS: D PTS: 1 DIF: moderate REF: 10.5
OBJ: Define molecular orbital theory.
TOP: bonding | bonding theories KEY: molecular orbital theory MSC: general chemistry
86. Which of the following statements is/are true?
1. Electrons are never found in an antibonding molecular orbital.
2. Antibonding molecular orbitals have electron density mainly outside the space between the two nuclei.
3. All antibonding molecular orbitals are higher in energy than the atomic
orbitals of which they are composed. A) 1 only B) 2 only C) 3 only D) 1 and 2 E) 2 and 3 ANS: E PTS: 1 DIF: moderate REF: 10.5
OBJ: Define bonding orbitals and antibonding orbitals.
TOP: bonding | bonding theories KEY: molecular orbital theory MSC: general chemistry
87. The nitrosyl ion, NO+, has ten bonding electrons and four antibonding electrons. Therefore, it has a bond order of A) 1. B) 5/2. C) 7. D) 2.