Q.

The correct order of decreasing polarisable ion is

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a

I-,Br-,Cl-,F-

b

F-,Cl-,Br-,I-

c

Cl-,Br-,I-,F-

d

F-,I-,Br-,Cl-

answer is C.

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Detailed Solution

The correct order of the polarisability of the anion is I-,Br-,Cl-,F-.
As the size of the anion increases, the charge to size ratio decreases and the polarisability increases.

Hence, the correct option is option (C) I-,Br-,Cl-,F-.

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