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


1.
Valence Bond Theory (VBT) was first introduced by:
A.
Hund and Mulliken
B.
Heitler and London
C.
Pauling and Slater
D.
Sidgwick and Powell
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ANSWER :
B. Heitler and London
2.
According to Valence Bond Theory, a covalent bond is formed by:
A.
Complete transfer of electrons from one atom to another
B.
Donation of an electron pair from one atom to another
C.
Sharing of electrons in molecular orbitals encompassing all atoms
D.
Overlap of atomic orbitals containing unpaired electrons of opposite spins
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ANSWER :
D. Overlap of atomic orbitals containing unpaired electrons of opposite spins
3.
Which of the following is a key feature of Valence Bond Theory?
A.
All bonds in a molecule are identical regardless of atoms involved
B.
Electrons are delocalized over the entire molecule
C.
Molecular orbitals are formed by combination of atomic orbitals
D.
Bond formation is explained in terms of overlap of atomic orbitals
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ANSWER :
D. Bond formation is explained in terms of overlap of atomic orbitals
4.
Which of the following is NOT a feature of Valence Bond Theory?
A.
It explains the paramagnetism of O₂ molecule
B.
It explains the formation of multiple bonds
C.
It explains the directional nature of covalent bonds
D.
It introduces the concept of hybridization
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ANSWER :
A. It explains the paramagnetism of O₂ molecule
5.
In the formation of H₂ molecule from two H atoms, the potential energy of the system:
A.
Decreases as H atoms approach, reaches minimum at bond distance, then increases sharply
B.
Remains constant
C.
Increases continuously
D.
Decreases continuously to zero
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ANSWER :
A. Decreases as H atoms approach, reaches minimum at bond distance, then increases sharply
6.
The bond length in H₂ molecule is:
A.
100 pm
B.
74 pm
C.
37 pm
D.
150 pm
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ANSWER :
B. 74 pm