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


13.
In the formation of a covalent bond, the orbitals must have:
A.
Same symmetry and proper orientation
B.
Same number of electrons
C.
Different shapes only
D.
Different sizes
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ANSWER :
A. Same symmetry and proper orientation
14.
Among s-s, s-p, and p-p (axial) overlaps, the strength order is:
A.
p-p > s-p > s-s
B.
s-s > s-p > p-p
C.
p-p > s-s > s-p
D.
s-p > p-p > s-s
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ANSWER :
A. p-p > s-p > s-s
15.
The formation of multiple bonds involves:
A.
Only pi bonds
B.
Only sigma bonds
C.
Only s-s overlap
D.
One sigma bond and one or more pi bonds
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ANSWER :
D. One sigma bond and one or more pi bonds
16.
The number of Οƒ and Ο€ bonds in Cβ‚‚Hβ‚„ (ethene) molecule are:
A.
5 Οƒ and 0 Ο€
B.
5 Οƒ and 1 Ο€
C.
4 Οƒ and 1 Ο€
D.
3 Οƒ and 2 Ο€
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ANSWER :
B. 5 Οƒ and 1 Ο€
17.
The number of Οƒ and Ο€ bonds in Cβ‚‚Hβ‚‚ (ethyne/acetylene) molecule are:
A.
3 Οƒ and 0 Ο€
B.
1 Οƒ and 3 Ο€
C.
2 Οƒ and 2 Ο€
D.
3 Οƒ and 2 Ο€
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ANSWER :
D. 3 Οƒ and 2 Ο€
18.
Hybridization is defined as:
A.
Process of intermixing atomic orbitals of slightly different energies to redistribute their energies, resulting in new orbitals of equivalent energies and shape
B.
Combination of nucleus with electrons
C.
Formation of ions from atoms
D.
Mixing of orbitals of greatly different energies to form orbitals of equal energy
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ANSWER :
A. Process of intermixing atomic orbitals of slightly different energies to redistribute their energies, resulting in new orbitals of equivalent energies and shape