Question

Select the correct statement(s).
(I) Polarizability of $S^{2-}$ is lower than $S{e}^{2-}$
(II) Polarizability of $S^{2-}$ is higher than $C{l}^{-}$
(III) Polarizability of $S^{2-}$ is lower 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. All of these

Answer 1

The correct option is A I, II and III

From Fajan's rule,
(I) & (IV) $\Rightarrow$ for similarly charged anions, higher the size of the anion, higher is its polarisability. Thus polarisability of $S{e}^{2-}>S^{2-}>O^{2-}$
(II) & (III) $\Rightarrow$ Higher the charge on the anion, higher is its polarisability.
$\therefore$ polarisability of $P^{3-}>S^{2-}>C{l}^{-}$