Quantum Mechanical Approach to Covalent Bonding (Valence Bond Theory - its Important Features, the Concept of Hybridization involving s, p, and d Orbitals; Resonance ) NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Quantum Mechanical Approach to Covalent Bonding (Valence Bond Theory - its Important Features, the Concept of Hybridization involving s, p, and d Orbitals; Resonance ) MCQ Questions


7.
Energy required to dissociate one mole of Hβ‚‚ into 2 H atoms is approximately:
A.
100 kJ/mol
B.
435.8 kJ/mol
C.
50 kJ/mol
D.
1000 kJ/mol
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ANSWER :
B. 435.8 kJ/mol
8.
Which type of forces of attraction operate between two H atoms approaching each other?
A.
Attractive forces between nucleus of one atom and electron of the other; repulsive forces between two nuclei and between two electrons
B.
Magnetic forces
C.
Only attractive forces
D.
Only repulsive forces
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ANSWER :
A. Attractive forces between nucleus of one atom and electron of the other; repulsive forces between two nuclei and between two electrons
9.
Which type of orbital overlap leads to a stronger covalent bond?
A.
Both are equally strong
B.
Zero overlap
C.
End-to-end (axial) overlap
D.
Sidewise (lateral) overlap
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ANSWER :
C. End-to-end (axial) overlap
10.
Sigma (Οƒ) bond is formed by:
A.
Sidewise overlap of p-orbitals
B.
No overlap of orbitals
C.
Diagonal overlap
D.
Axial (head-on) overlap of orbitals along the internuclear axis
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ANSWER :
D. Axial (head-on) overlap of orbitals along the internuclear axis
11.
Pi (Ο€) bond is formed by:
A.
Axial overlap of p orbitals along the bond axis
B.
Overlap of d orbitals only
C.
Sidewise (lateral) overlap of p orbitals perpendicular to the internuclear axis
D.
Axial overlap of s orbitals
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ANSWER :
C. Sidewise (lateral) overlap of p orbitals perpendicular to the internuclear axis
12.
The bond strength order is:
A.
Ο€-bond > Οƒ-bond
B.
Οƒ-bond > Ο€-bond
C.
Οƒ-bond = Ο€-bond
D.
Cannot be determined
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ANSWER :
B. Οƒ-bond > Ο€-bond