Question

Select the correct statement(s).
(i) Polarizability of $S^{2-}$ is lesser than $S{e}^{2-}$
(ii) Polarizability of $S^{2-}$ is higher than $C{l}^{-}$
(iii) polarizability of $S^{2-}$ is lesser than $P^{3-}$
(iv) Polarizability of $O^{2-}$ is higher than $S^{2-}$

• A. I, II, and III
• B. I and II
• C. II and IV
• D. None of these

Answer 1

The correct option is A I, II, and III

Polarizability of an anion depends upon the size and the charge on the anion. Larger the size and greater the charge, more will be its polarizability.

(i) In $S^{2-}$ and $S{e}^{2-}$, the anions have the same magnitude of charge but the size of $S{e}^{2-}$ is larger than that of $S^{2-}$. Hence, the polarizability of $S{e}^{2-}$ is higher than that of $S^{2-}$.

(ii) In $S^{2-}$ and $C{l}^{-}$, $S^{2-}$ has more negative charge than $C{l}^{-}$ and also the size of $S^{2-}$ is larger than that of $C{l}^{-}$. Hence, the polarizability of $S^{2-}$ is higher than that of $C{l}^{-}$.

(iii) In $S^{2-}$ and $P^{3-}$, $S^{2-}$ has less negative charge than $P^{3-}$ and also the size of $P^{3-}$ is larger than that of $S^{2-}$. Hence, the polarizability of $P^{3-}$ is higher than that of $S^{2-}$.

(iv) In $S^{2-}$ and $O^{2-}$, $S^{2-}$ has the same negative charge as $O^{2-}$ but the size of $S^{2-}$ is larger than that of $O^{2-}$. Hence, the polarizability of $S^{2-}$ is higher than that of $O^{2-}$.