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Question

Select the correct statement(s).
(I) Polarisability of S2− is lower than Se2−
(II) Polarisability of S2− is higher than Cl−
(III) Polarisability of S2− is lower than P3−
(IV) Polarisability of O2− is higher than S2−

A
I, II and III
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B
I and II
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C
II and IV
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D
All of these
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Solution

The correct option is A I, II and III
According to Fajan's rule, polarisability increases with the increase in negative charge and the size of the anion.
The charge on S2 is higher than that on Cl and smaller than that onP3. Also, the size of S2 is smaller than Se2. Hence, the polarisability of S2 is higher than Cl but smaller than P3 and Se2.
S2 has a larger size than O2, so the former has more polarisability.

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