Q. Which of the following pairs of molecules has the same bond order?
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A.
N2 and CO
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B.
O2 and F2
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C.
C2 and B2
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D.
He2 and Ne2
Solution
N2 and CO both have a bond order of 3.
Correct Answer: A — N2 and CO
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Q. Which of the following species has a bond order of 1?
Solution
F2 has a bond order of 1, calculated as (8 bonding electrons - 6 antibonding electrons)/2 = 1.
Correct Answer: C — F2
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Q. Which of the following species has the highest bond order?
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A.
O2+
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B.
O2
-
C.
O2-
-
D.
O2 2-
Solution
O2+ has a bond order of 2.5, which is higher than O2 (2), O2- (1.5), and O2 2- (1).
Correct Answer: A — O2+
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Q. Which of the following statements about molecular orbitals is correct?
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A.
Molecular orbitals are formed by the overlap of atomic orbitals.
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B.
Molecular orbitals can only be occupied by one electron.
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C.
Bonding molecular orbitals have higher energy than antibonding orbitals.
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D.
Molecular orbitals do not influence the shape of molecules.
Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer: A — Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements about molecular orbitals is incorrect?
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A.
Molecular orbitals can be occupied by a maximum of two electrons.
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B.
Bonding orbitals are lower in energy than antibonding orbitals.
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C.
Molecular orbitals are formed from the linear combination of atomic orbitals.
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D.
All molecular orbitals are degenerate.
Solution
Not all molecular orbitals are degenerate; some can have different energy levels.
Correct Answer: D — All molecular orbitals are degenerate.
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Q. Which of the following statements about molecular orbitals is true?
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A.
Molecular orbitals are formed by the overlap of atomic orbitals.
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B.
Molecular orbitals can only be occupied by one electron.
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C.
Molecular orbitals do not have any energy levels.
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D.
Molecular orbitals are only found in diatomic molecules.
Solution
Molecular orbitals are indeed formed by the overlap of atomic orbitals.
Correct Answer: A — Molecular orbitals are formed by the overlap of atomic orbitals.
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Q. Which of the following statements is correct regarding the molecular orbital theory?
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A.
It explains the magnetic properties of molecules.
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B.
It does not apply to diatomic molecules.
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C.
It only considers sigma bonds.
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D.
It is not applicable to resonance structures.
Solution
Molecular orbital theory explains the magnetic properties of molecules, including paramagnetism and diamagnetism.
Correct Answer: A — It explains the magnetic properties of molecules.
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Q. Which of the following statements is incorrect regarding molecular orbitals?
-
A.
Molecular orbitals can be occupied by a maximum of two electrons.
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B.
Bonding molecular orbitals are lower in energy than the corresponding atomic orbitals.
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C.
Antibonding molecular orbitals are higher in energy than the corresponding atomic orbitals.
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D.
All molecular orbitals are degenerate.
Solution
Not all molecular orbitals are degenerate; some can have different energy levels.
Correct Answer: D — All molecular orbitals are degenerate.
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Q. Which of the following statements is true about the molecular orbital theory?
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A.
It only applies to diatomic molecules
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B.
It explains the magnetic properties of molecules
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C.
It does not consider electron spin
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D.
It is less accurate than valence bond theory
Solution
Molecular orbital theory explains the magnetic properties of molecules, particularly the presence of unpaired electrons.
Correct Answer: B — It explains the magnetic properties of molecules
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Q. Which of the following statements is true according to molecular orbital theory?
-
A.
Bonding orbitals are higher in energy than antibonding orbitals.
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B.
Bonding orbitals are lower in energy than antibonding orbitals.
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C.
All molecular orbitals are degenerate.
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D.
Molecular orbitals do not influence bond length.
Solution
Bonding orbitals are lower in energy than antibonding orbitals, which is a fundamental principle of molecular orbital theory.
Correct Answer: B — Bonding orbitals are lower in energy than antibonding orbitals.
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Q. Which of the following statements is true regarding the energy levels of molecular orbitals?
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A.
σ orbitals are always lower in energy than π orbitals.
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B.
π orbitals are always lower in energy than σ orbitals.
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C.
For second period elements, σ2p is lower than π2p.
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D.
Bonding orbitals are higher in energy than antibonding orbitals.
Solution
For second period elements, σ2p is lower in energy than π2p.
Correct Answer: C — For second period elements, σ2p is lower than π2p.
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Q. Which of the following statements is true regarding the molecular orbital configuration of O2?
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A.
It has 2 unpaired electrons
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B.
It has 4 unpaired electrons
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C.
It is diamagnetic
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D.
It has a bond order of 3
Solution
O2 has 2 unpaired electrons in its molecular orbital configuration, making it paramagnetic.
Correct Answer: A — It has 2 unpaired electrons
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Q. Which of the following statements is true regarding the molecular orbital theory?
-
A.
It only applies to diatomic molecules.
-
B.
It explains the magnetic properties of molecules.
-
C.
It does not consider electron spin.
-
D.
It is less accurate than valence bond theory.
Solution
Molecular orbital theory explains the magnetic properties of molecules, such as paramagnetism in O2.
Correct Answer: B — It explains the magnetic properties of molecules.
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