91. Which of the following molecules has a bond angle of approximately 180°?
A) CO2
B) H2O
C) NH3
D) CH4
Answer: A
Explanation: CO2 has a linear molecular geometry with bond angles of approximately 180°.
92. Which of the following has a higher bond energy, N2 or O2?
A) N2
B) O2
C) They have equal bond energy.
D) Cannot be determined
Answer: A
Explanation: N2 has a triple bond, which results in higher bond energy compared to the double bond in O2.
93. What type of bond is formed when two atomic orbitals combine in a head-on manner?
A) Pi bond
B) Sigma bond
C) Delta bond
D) Hydrogen bond
Answer: B
Explanation: Sigma bonds are formed by the head-on overlap of atomic orbitals.
94. Which molecule has the highest bond order?
A) O2
B) N2
C) H2
D) F2
Answer: B
Explanation: N2 has a bond order of 3 (triple bond), which is the highest among the given options.
95. Which molecular orbital results from the combination of two p orbitals?
A) σ2p
B) π2p
C) σ*2p
D) Both A and B
Answer: B
Explanation: π2p molecular orbitals are formed from the lateral overlap of two p orbitals.
96. Which of the following species has a bond order of 0?
A) He2
B) H2
C) Li2
D) N2
Answer: A
Explanation: He2 has no net bonding interaction, resulting in a bond order of 0.
97. Which molecule exhibits hybridization of sp²?
A) BeCl2
B) CH2O
C) C2H4
D) NH3
Answer: C
Explanation: C2H4 (ethylene) exhibits sp² hybridization due to the presence of a double bond.
98. What is the primary reason for the formation of a double bond?
A) Overlap of s orbitals
B) Overlap of p orbitals
C) Both A and B
D) None of the above
Answer: C
Explanation: A double bond is formed by one sigma bond and one pi bond, requiring the overlap of both s and p orbitals.
99. Which molecular orbital diagram shows a transition between bonding and antibonding orbitals?
A) O2
B) N2
C) CO
D) He2
Answer: A
Explanation: O2 shows a transition in the energy levels of bonding and antibonding orbitals due to its unique electronic configuration.
100. Which molecule has a bond order of 3?
A) O2
B) N2
C) F2
D) He2
Answer: B
Explanation: N2 has a bond order of 3, indicating a triple bond between the two nitrogen atoms
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