Quantum Mechanical Approach to Covalent Bonding (Valence Bond Theory - its Important Features, the Concept of Hybridization involving s, p, and d Orbitals; Resonance )
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:
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
C.
Only attractive forces
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
C.
End-to-end (axial) overlap
D.
Sidewise (lateral) overlap
ANSWER :
C. End-to-end (axial) overlap
10.
Sigma (Ο) bond is formed by:
A.
Sidewise overlap of p-orbitals
B.
No overlap of orbitals
D.
Axial (head-on) overlap of orbitals along the internuclear axis
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
ANSWER :
C. Sidewise (lateral) overlap of p orbitals perpendicular to the internuclear axis
12.
The bond strength order is:
ANSWER :
B. Ο-bond > Ο-bond
