Multiple
Choice
Identify the letter of the choice that best completes the statement or answers the
question.
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1.
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All of the following statements
concerning valence bond (VB) and molecular orbital (MO) bond theories are correct
EXCEPT a. | MO theory predicts that electrons are delocalized over the
molecule. | b. | in VB theory, bonding electrons are localized between pairs of
atoms. | c. | VB theory describes a molecular bond as the overlap between two atomic
orbitals. | d. | MO theory can describe molecular bonding in excited
states. | e. | VB theory is used to predict the colors of
compounds. | | |
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2.
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What is the hybridization of
the iodine atom in periodate ion, IO4-? a. | sp | b. | sp2 | c. | sp3 | d. | sp3d | e. | sp3d2 | | |
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3.
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What is the hybridization of
the central atom in a molecule with a square-planar molecular geometry? a. | sp | b. | sp2 | c. | sp3 | d. | sp3d | e. | sp3d2 | | |
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4.
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What is the molecular geometry
around a central atom that is sp3d2 hybridized and has two lone
electron-pairs? a. | tetrahedral | b. | trigonal-bipyramidal | c. | square-planar | d. | square-pyramidal | e. | see-saw | | |
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5.
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What is the molecular geometry
around a central atom that is sp3d hybridized and has three sigma bonds and
two lone electron-pairs? a. | linear | b. | trigonal-pyramidal | c. | trigonal-planar | d. | tetrahedral | e. | T-shaped | | |
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Molecular Orbital
Theory
The following molecular orbital diagram may be used for the following problems. For
oxygen and fluorine, the σ2p orbital should be lower in
energy than the π2p. However, the diagram will
still yield correct bond order and magnetic behavior for these molecules.
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6.
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According to molecular orbital
theory, what is the bond order of nitrogen, N2?
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7.
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According to molecular orbital
theory, which of the following lists ranks the nitrogen species in terms of increasing bond
order? a. | N2- < N22- <
N2 | b. | N2- < N2 <
N22- | c. | N2 <
N2- < N22- | d. | N22- < N2- <
N2 | e. | N2 < N22- <
N2- | | |
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8.
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Use molecular orbital theory to
predict which species has the shortest bond length. a. | O22+ | b. | O2+ | c. | O2 | d. | O2- | e. | O22- | | |
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9.
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According to molecular orbital
theory, which of the following species is least likely to exist? a. | H2- | b. | F22+ | c. | C22- | d. | Li2 | e. | B22+ | | |
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10.
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Which molecule will have the
following valence molecular orbital energy level diagram?
a. | C22- | b. | N22+ | c. | N22- | d. | O22- | e. | F22+ | | |
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