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Polarisability and Fajan's Rule

Select the co...

Question

Select the correct statement(s).
$(I)$ Polarisability of $S^{2 -}$ is lower than $S e^{2 -}$
$(I I)$ Polarisability of $S^{2 -}$ is higher than $C l^{-}$
$(I I I)$ Polarisability of $S^{2 -}$ is lower than $P^{3 -}$
$(I V)$ Polarisability of $O^{2 -}$ is higher than $S^{2 -}$

A

I, I I

and

I I I

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B

I

and

I I

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C

I I

and

I V

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D

All of these

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Solution

The correct option is A $I, I I$ and $I I I$
According to Fajan's rule, polarisability increases with the increase in negative charge and the size of the anion.
The charge on $S^{2 -}$ is higher than that on $C l^{-}$ and smaller than that on $P^{3 -}$ . Also, the size of $S^{2 -}$ is smaller than $S e^{2 -}$ . Hence, the polarisability of $S^{2 -}$ is higher than $C l^{-}$ but smaller than $P^{3 -}$ and $S e^{2 -}$ .
$S^{2 -}$ has a larger size than $O^{2 -}$ , so the former has more polarisability.

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Polarisability of

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Polarisability and Fajan's Rule

Standard XII Chemistry

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