Covalent Bonding (Concept of Electronegativity. Fajan’s Rule, Dipole Moment) NEET Questions

Physical Chemistry - Chemical Bonding and Molecular Structure

Covalent Bonding (Concept of Electronegativity. Fajan’s Rule, Dipole Moment) MCQ Questions


13.
Pauling's electronegativity scale is based on:
A.
Ionization energy and electron affinity
B.
Atomic radius alone
C.
Bond dissociation energies of homonuclear and heteronuclear bonds
D.
Effective nuclear charge
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ANSWER :
C. Bond dissociation energies of homonuclear and heteronuclear bonds
14.
The electronegativity difference between hydrogen and the halogens decreases in the order F > Cl > Br > I. This is because:
A.
Bond energies are constant
B.
Hydrogen's electronegativity changes
C.
The size of halogens increases in this order, leading to lower electron-attracting tendency
D.
The size of halogens decreases in this order
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ANSWER :
C. The size of halogens increases in this order, leading to lower electron-attracting tendency
15.
According to Fajan's rules, the covalent character of an ionic bond increases when:
A.
The cation is large and the anion is small
B.
The cation is small and the anion is large
C.
The cation has high charge and the anion has low charge
D.
Both the cation and the anion are large
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ANSWER :
B. The cation is small and the anion is large
16.
Which of the following compounds has the maximum covalent character?
A.
LiF
B.
LiBr
C.
LiCl
D.
LiI
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ANSWER :
D. LiI
17.
Which of the following has the maximum polarizing power?
A.
Na⁺
B.
Al³⁺
C.
K⁺
D.
Mg²⁺
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ANSWER :
B. Al³⁺
18.
Which of the following anions is most polarizable?
A.
F⁻
B.
Br⁻
C.
Cl⁻
D.
I⁻
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ANSWER :
D. I⁻