Which one of the following statements is false?

1
Which one of the following statements is false?

1. Valence bond theory and molecular orbital theory
   can be described as two different views of the
   same thing.
2. When one considers the molecular orbitals
   resulting from the overlap of any two specific
   atomic orbitals, the bonding orbitals are always
   lower in energy than the antibonding orbitals.
3. Molecular orbitals are generally described as
   being more delocalized than hybridized atomic
   orbitals.
4. One of the shortcomings of molecular orbital
   theory is its inability to account for a triple
   bond in the N2 molecule.
5. One of the shortcomings of valence bond theory is
   its inability to account for the paramagnetism of
   O2.

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2
What is the bond order of a species with 7
bonding electrons and 4 antibonding electrons?

1. 1
2. 1.5
3. 2
4. 2.5
5. 3

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3
Draw the molecular orbital diagram for N2. The
number of electrons in the image molecular
orbital is _____.

1. 1
2. 2
3. 3
4. 4
5. zero

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4
Draw the molecular orbital diagram for F2. The
number of electrons in the image molecular
orbital is _____.

1. 1
2. 2
3. 3
4. 4
5. zero

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5
What is the bond order for F2?

1. 1
2. 2
3. 3
4. 4.5
5. 2.5

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6
Which response lists only the molecules given
below that are not paramagnetic? B2, C2, N2, O2,
F2

1. N2 and F2
2. N2 and O2
3. B2 and O2
4. B2 and N2
5. all of these

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7
What diatomic molecule and/or ion(s) would have
the molecular orbital electron configuration
given below? image

1. O2- and F2
2. O2and F2
3. F2- and Ne2
4. F2 and O2-
5. O2 and F2-

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8
Which response lists all the following diatomic
molecules and ions that are paramagnetic? Be2,
B2, B22, C22, C22, O2-, O22-

1. B22, C22, and O22-
2. Be2 and B2
3. B2, C22, and C22-
4. B2, C22, and O22-
5. B2, C22, and O2-

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9
Which of the following statements concerning
homonuclear diatomic molecules of the third and
subsequent periods is false?

1. The heavier halogens, Cl2, Br2, and I2, which
   contain only sigma (single) bonds, are the only
   well-characterized examples at room temperature.
2. Other homonuclear diatomic species (other than
   the halogens) are neither common nor very stable.
3. The heavier elements are unstable because they
   cannot form strong pi bonds with each other.
4. For these larger atoms the sigma bond length is
   too great to allow the atomic p orbitals on
   different atoms to overlap side-on-side
   effectively.
5. All of the above statements explain why P2 is
   much more stable than N2.

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10
What is the bond order for NO?

1. 0.5
2. 1
3. 1.5
4. 2
5. 2.5

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