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Valence bond theory is able to explain why molecular oxygen is paramagnetic.

A) True
B) False

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Which of the following statements relating to molecular orbital (MO) theory is incorrect?


A) Combination of two atomic orbitals produces one bonding and one antibonding MO.
B) A bonding MO is lower in energy than the two atomic orbitals from which it is formed.
C) Combination of two 2p orbitals may result in either σ orπ MOs.
D) A species with a bond order of zero will not be stable.
E) In a stable molecule having an even number of electrons, all electrons must be paired.

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

Correct Answer

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In the valence bond treatment, a π bond is formed when two 2p orbitals overlap side to side.

A) True
B) False

Correct Answer

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Overlap of two sp2 hybrid orbitals produces a π bond.

A) True
B) False

Correct Answer

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The lone pair of electrons on sulfur in the sulfite ion (SO32−) is in


A) a p orbital.
B) an s orbital.
C) an sp 2 hybrid orbital.
D) an sp 3 hybrid orbital.
E) none of these orbital types.

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

Correct Answer

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A molecule with the formula AX4E2 uses __________ to form its bonds.


A) sp hybrid orbitals
B) sp 2 hybrid orbitals
C) sp 3 hybrid orbitals
D) sp 3 d hybrid orbitals
E) sp 3 d 2 hybrid orbitals

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

Correct Answer

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According to valence bond theory, which orbitals on N and H overlap in the NH3 molecule?


A) 2 p on N overlaps with 2 s on H
B) 2 p on N overlaps with 1 s on H
C) 2 s on N overlaps with 1 s on H
D) sp 3 on N overlaps with sp on H
E) sp 3 on N overlaps with 1 s on H

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

Correct Answer

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In molecular orbital theory, combination of two atomic orbitals produces two molecular orbitals.

A) True
B) False

Correct Answer

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