MCQ
In an ionic compound $A^+ X^-$ the degree of covalent bonding is greatest when
- A$A^+$ and $X^-$ ion are small
- ✓$A^+$ is small and $X^-$ is large
- C$A^+$ and $X^-$ ions are approximately of the same size
- D$X^-$ is small and $A^+$ is large
✓
Answer
Correct option: B.
$A^+$ is small and $X^-$ is large
b
Due to Fazan's rule, according to which the cation distorts the electron cloud of the anion and pulls the electron density towards itself. Thus it introduces some covalent character in the lonic bond. Now, the smaller the cation, greater is its polarising power and larger the anion, greater will be its polarisability hence $A +$ is small and $X -$ is large.
Due to Fazan's rule, according to which the cation distorts the electron cloud of the anion and pulls the electron density towards itself. Thus it introduces some covalent character in the lonic bond. Now, the smaller the cation, greater is its polarising power and larger the anion, greater will be its polarisability hence $A +$ is small and $X -$ is large.
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