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What is the number of lone electron pairs on the central atom of a molecule having a seesaw molecular geometry, such as SF4?


A) 1
B) 2
C) 3
D) 4
E) 6

F) B) and C)
G) A) and E)

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Allene, C3H4 (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? Allene, C<sub>3</sub>H<sub>4</sub> (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? A) It shares four bonds, two with each carbon atom on either side. B) It shares four σ bonds, two with each carbon atom on either side. C) It shares one σ bond and one bond with each carbon atom on either side. D) It shares two σ bonds with the carbon atom on the left, and two bonds with the carbon atom on the right. E) It shares two σ bonds with the carbon atom on the right, and two bonds with the carbon atom on the left.


A) It shares four Allene, C<sub>3</sub>H<sub>4</sub> (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? A) It shares four bonds, two with each carbon atom on either side. B) It shares four σ bonds, two with each carbon atom on either side. C) It shares one σ bond and one bond with each carbon atom on either side. D) It shares two σ bonds with the carbon atom on the left, and two bonds with the carbon atom on the right. E) It shares two σ bonds with the carbon atom on the right, and two bonds with the carbon atom on the left. bonds, two with each carbon atom on either side.
B) It shares four σ bonds, two with each carbon atom on either side.
C) It shares one σ bond and one Allene, C<sub>3</sub>H<sub>4</sub> (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? A) It shares four bonds, two with each carbon atom on either side. B) It shares four σ bonds, two with each carbon atom on either side. C) It shares one σ bond and one bond with each carbon atom on either side. D) It shares two σ bonds with the carbon atom on the left, and two bonds with the carbon atom on the right. E) It shares two σ bonds with the carbon atom on the right, and two bonds with the carbon atom on the left. bond with each carbon atom on either side.
D) It shares two σ bonds with the carbon atom on the left, and two Allene, C<sub>3</sub>H<sub>4</sub> (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? A) It shares four bonds, two with each carbon atom on either side. B) It shares four σ bonds, two with each carbon atom on either side. C) It shares one σ bond and one bond with each carbon atom on either side. D) It shares two σ bonds with the carbon atom on the left, and two bonds with the carbon atom on the right. E) It shares two σ bonds with the carbon atom on the right, and two bonds with the carbon atom on the left. bonds with the carbon atom on the right.
E) It shares two σ bonds with the carbon atom on the right, and two Allene, C<sub>3</sub>H<sub>4</sub> (shown below) , is one component of gas used for high-temperature welding. According to the valence bond model, which is a proper description of the bonding on the central carbon atom in allene? A) It shares four bonds, two with each carbon atom on either side. B) It shares four σ bonds, two with each carbon atom on either side. C) It shares one σ bond and one bond with each carbon atom on either side. D) It shares two σ bonds with the carbon atom on the left, and two bonds with the carbon atom on the right. E) It shares two σ bonds with the carbon atom on the right, and two bonds with the carbon atom on the left. bonds with the carbon atom on the left.

F) D) and E)
G) A) and D)

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The PCl5 molecule has


A) nonpolar bonds, and is a nonpolar molecule.
B) nonpolar bonds, but is a polar molecule.
C) polar bonds, and is a polar molecule.
D) polar bonds, but is a nonpolar molecule.

E) A) and B)
F) A) and C)

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Consider the species N2-, N2, and N2+. Which of these species will be paramagnetic?


A) N2 and N2-
B) N2+ and N2
C) N2+ and N2-
D) N2-, N2, and N2+
E) None is paramagnetic.

F) All of the above
G) B) and C)

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The BrF5 molecule has polar bonds and has a net dipole moment.

A) True
B) False

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What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as ClF2-?


A) 1
B) 2
C) 3
D) 0
E) 4

F) D) and E)
G) A) and E)

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How many electron domains are on the central atom for a sp2 hybridized atom?

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Which molecular formula corresponds to a structural formula with carbon atoms having hybridizations of sp, sp2, and sp3?


A) C3H6
B) C4H4
C) C4H6
D) C5H6
E) C5H8

F) A) and C)
G) A) and E)

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What is the total number of electron domains around the central atom for a molecule having a square pyramidal molecular geometry, such as ClF5?


A) 5
B) 2
C) 3
D) 4
E) 6

F) B) and D)
G) A) and E)

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According to molecular orbital theory, what is the bond order of the hypofluorite ion, OF-?


A) 0
B) 0.5
C) 1
D) 1.5
E) 2

F) A) and C)
G) C) and D)

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Which figure best illustrates the hybrid orbitals on carbon in benzene, C6H6?


A) Which figure best illustrates the hybrid orbitals on carbon in benzene, C<sub>6</sub>H<sub>6</sub>? A) B) C) D) E)
B) Which figure best illustrates the hybrid orbitals on carbon in benzene, C<sub>6</sub>H<sub>6</sub>? A) B) C) D) E)
C) Which figure best illustrates the hybrid orbitals on carbon in benzene, C<sub>6</sub>H<sub>6</sub>? A) B) C) D) E)
D) Which figure best illustrates the hybrid orbitals on carbon in benzene, C<sub>6</sub>H<sub>6</sub>? A) B) C) D) E)
E) Which figure best illustrates the hybrid orbitals on carbon in benzene, C<sub>6</sub>H<sub>6</sub>? A) B) C) D) E)

F) A) and B)
G) B) and C)

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The number of π bonds in phosgene, COCl2, is


A) 0.
B) 1.
C) 2.
D) 3.
E) 4.

F) A) and E)
G) A) and B)

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What is the molecular geometry of HOF as predicted by the VSEPR model?


A) trigonal pyramidal
B) bent
C) tetrahedral
D) linear
E) trigonal planar

F) None of the above
G) A) and B)

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In one sentence state the basic principle of valence bond theory.

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A covalent bond forms when the...

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What is the molecular geometry of SiF62- as predicted by the VSEPR model? What is the molecular geometry of SiF<sub>6</sub><sup>2-</sup> as predicted by the VSEPR model? A) trigonal bipyramidal B) octahedral C) tetrahedral D) seesaw E) square pyramidal


A) trigonal bipyramidal
B) octahedral
C) tetrahedral
D) seesaw
E) square pyramidal

F) C) and D)
G) All of the above

Correct Answer

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The hybridization of the central nitrogen atom in the molecule N2O is


A) sp.
B) sp2.
C) sp3.
D) sp3d.
E) sp3d2.

F) C) and D)
G) B) and C)

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What is the predicted O-C-O bond angle in CO2?


A) 60°
B) 90°
C) 109.5°
D) 120°
E) 180°

F) A) and B)
G) C) and E)

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Atoms of period 3 and beyond can undergo sp3d2 hybridization, but atoms of period 2 cannot.

A) True
B) False

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Indicate the type of hybrid orbitals used by the central atom in SF6.


A) sp
B) sp2
C) sp3
D) sp3d
E) sp3d2

F) A) and B)
G) All of the above

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Which figure best illustrates the hybrid orbitals on phosphorous in PH3?


A) Which figure best illustrates the hybrid orbitals on phosphorous in PH<sub>3</sub>? A) B) C) D) E)
B) Which figure best illustrates the hybrid orbitals on phosphorous in PH<sub>3</sub>? A) B) C) D) E)
C) Which figure best illustrates the hybrid orbitals on phosphorous in PH<sub>3</sub>? A) B) C) D) E)
D) Which figure best illustrates the hybrid orbitals on phosphorous in PH<sub>3</sub>? A) B) C) D) E)
E) Which figure best illustrates the hybrid orbitals on phosphorous in PH<sub>3</sub>? A) B) C) D) E)

F) All of the above
G) B) and E)

Correct Answer

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