Q. What is the molecular orbital configuration of F2?
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A.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)²
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B.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴
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C.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(π2p)⁴(π*2p)²
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D.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)³(π*2p)²
Solution
The correct configuration for F2 is (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)².
Correct Answer: A — (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)²
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Q. What is the molecular orbital configuration of O2?
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A.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹
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B.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)²
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C.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)³
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D.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)⁴
Solution
The correct configuration for O2 is (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹.
Correct Answer: A — (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹
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Q. What is the molecular orbital configuration of the F2 molecule?
-
A.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)²
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B.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)⁴
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C.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)¹
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D.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)³(π*2p)²
Solution
The correct configuration for F2 is (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)².
Correct Answer: A — (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)⁴(π*2p)²
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Q. What is the molecular orbital configuration of the O2 molecule?
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A.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹
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B.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)²
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C.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)¹(π*2p)¹
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D.
(σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)¹(π*2p)²
Solution
The correct configuration for O2 is (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹.
Correct Answer: A — (σ1s)²(σ*1s)²(σ2s)²(σ*2s)²(σ2p)²(π2p)²(π*2p)¹
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Q. What is the shape of the molecular orbital in the case of a π bond?
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A.
Spherical
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B.
Dumbbell
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C.
Linear
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D.
Planar
Solution
π bonds are formed by the side-to-side overlap of p orbitals, resulting in a planar shape.
Correct Answer: D — Planar
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Q. What is the shape of the molecular orbital in the highest occupied molecular orbital (HOMO) of benzene?
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A.
Linear
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B.
Trigonal planar
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C.
Tetrahedral
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D.
Cyclic
Solution
The HOMO of benzene is cyclic due to the delocalization of π electrons in the ring structure.
Correct Answer: D — Cyclic
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Q. What is the shape of the molecular orbital of the highest energy in O2?
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A.
spherical
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B.
dumbbell
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C.
double dumbbell
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D.
linear
Solution
The highest energy molecular orbital in O2 is a π* orbital, which has a dumbbell shape.
Correct Answer: B — dumbbell
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Q. What is the shape of the molecular orbital of the highest energy in the O2 molecule?
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A.
Linear
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B.
Bent
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C.
Planar
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D.
Diatomic
Solution
The highest energy molecular orbital in O2 is a diatomic molecular orbital, specifically a π* orbital.
Correct Answer: D — Diatomic
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Q. Which of the following diatomic molecules has a bond order of 1?
Solution
H2 has a bond order of 1, calculated as (2 bonding electrons - 0 antibonding electrons)/2 = 1.
Correct Answer: C — H2
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Q. Which of the following diatomic molecules has the highest bond order?
Solution
N2 has the highest bond order of 3, while O2 has a bond order of 2 and F2 has a bond order of 1.
Correct Answer: A — N2
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Q. Which of the following has a bond angle of approximately 120 degrees?
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A.
H2O
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B.
NH3
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C.
BF3
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D.
CH4
Solution
BF3 has a trigonal planar geometry with bond angles of approximately 120 degrees.
Correct Answer: C — BF3
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Q. Which of the following has a bond order of 0?
Solution
He2 has a bond order of 0, calculated as (2 bonding electrons - 2 antibonding electrons)/2 = 0.
Correct Answer: A — He2
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Q. Which of the following has a bond order of 1?
Solution
H2 has a bond order of 1, calculated as (2 bonding electrons - 0 antibonding electrons)/2 = 1.
Correct Answer: C — H2
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Q. Which of the following has the highest bond order?
Solution
N2 has the highest bond order of 3 among the given options.
Correct Answer: A — N2
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Q. Which of the following has the lowest bond energy?
Solution
F2 has the lowest bond energy due to the repulsion between the lone pairs on the fluorine atoms.
Correct Answer: C — F2
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Q. Which of the following has the lowest bond order?
Solution
He2 has a bond order of 0, calculated as (2 bonding electrons - 2 antibonding electrons)/2 = 0.
Correct Answer: D — He2
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Q. Which of the following molecular orbitals is filled first according to the Aufbau principle?
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A.
σ1s
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B.
σ*1s
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C.
π2p
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D.
σ2p
Solution
According to the Aufbau principle, the σ1s molecular orbital is filled first as it has the lowest energy.
Correct Answer: A — σ1s
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Q. Which of the following molecular orbitals is lower in energy than the 2p atomic orbitals?
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A.
σ2s
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B.
σ*2s
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C.
π2p
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D.
σ2p
Solution
σ2s is lower in energy than the 2p atomic orbitals.
Correct Answer: A — σ2s
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Q. Which of the following molecules has a bond order of 1?
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A.
H2
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B.
He2
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C.
Li2
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D.
B2
Solution
Li2 has a bond order of 1, calculated as (2 bonding electrons - 0 antibonding electrons)/2 = 1.
Correct Answer: C — Li2
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Q. Which of the following molecules has a bond order of 2?
Solution
N2 has a bond order of 2, calculated as (number of bonding electrons - number of antibonding electrons)/2 = (10-6)/2 = 2.
Correct Answer: B — N2
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Q. Which of the following molecules has a higher bond order than N2?
Solution
O2 has a bond order of 2, while N2 has a bond order of 3, so none have a higher bond order than N2.
Correct Answer: A — O2
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Q. Which of the following molecules has a higher bond order: N2 or O2?
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A.
N2
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B.
O2
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C.
Both are equal
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D.
Cannot be determined
Solution
N2 has a bond order of 3, while O2 has a bond order of 2, so N2 has a higher bond order.
Correct Answer: A — N2
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Q. Which of the following molecules has a triple bond?
Solution
N2 has a triple bond, consisting of one sigma bond and two pi bonds.
Correct Answer: A — N2
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Q. Which of the following molecules has the highest bond order?
Solution
N2 has the highest bond order of 3, calculated as (10 bonding electrons - 2 antibonding electrons)/2 = 3.
Correct Answer: A — N2
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Q. Which of the following molecules is diamagnetic?
Solution
F2 is diamagnetic as it has all electrons paired in its molecular orbitals.
Correct Answer: C — F2
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Q. Which of the following molecules is isoelectronic with N2?
Solution
C2 is isoelectronic with N2, both having 10 electrons.
Correct Answer: B — C2
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Q. Which of the following molecules is isoelectronic with Ne?
Solution
N2 is isoelectronic with Ne, both having 10 electrons.
Correct Answer: C — N2
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Q. Which of the following molecules is predicted to be stable according to molecular orbital theory?
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A.
He2
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B.
Li2
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C.
Be2
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D.
B2
Solution
Li2 is stable with a bond order of 1, while He2 and Be2 are not stable.
Correct Answer: B — Li2
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Q. Which of the following pairs of atoms will form a bond with the highest bond order?
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A.
C and O
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B.
N and O
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C.
C and N
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D.
O and O
Solution
C and N will form a bond with the highest bond order of 3, as seen in the molecule CN.
Correct Answer: C — C and N
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Q. Which of the following pairs of atoms will form a stable diatomic molecule according to molecular orbital theory?
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A.
N and O
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B.
O and F
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C.
C and N
-
D.
B and O
Solution
C and N will form a stable diatomic molecule as they have suitable bond orders and electron configurations.
Correct Answer: C — C and N
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