The most polarisable ion among the following | vedclass

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Question

(B) According to $Fajans'$ rule,the polarisability of an ion depends on its size and charge. For ions with the same charge,the larger the size of the

Vedclass · Accepted Answer

$I^{-}$

Vedclass · Answer

(B) According to $Fajans'$ rule,the polarisability of an ion depends on its size and charge. For ions with the same charge,the larger the size of the anion,the more easily its electron cloud can be distorted,leading to higher polarisability. Comparing the given anions $(F^{-}, Cl^{-}, I^{-})$,the size increases down the group as $F^{-} Therefore,the $I^{-}$ ion has the largest size and is the most polarisable.

The most polarisable ion among the following is

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