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The charge/size ratio of a cation determ...

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, `K^(+), Ca^(2+), Mg^(2+), Ba^(2+)`?

A

`Ca^(2+) lt Mg^(2+) lt Be^(2+) lt K^(+)`

B

`Mg^(2+) lt Be^(2+) lt K^(+) lt Ca^(2+)`

C

`Be^(2+) lt K^(+) lt Ca^(2+) lt Mg^(2+)`

D

`K^(+) lt Ca^(2+) lt Mg^(2+) lt Be^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
D
Smaller the size and higher the charge, more will be polarizing power of cation. Since the order of the size of cations is `K^(+) gt Ca^(+ +) gt Mg^(+ +)` so the correct order of polarizing power is `K^(+) lt Ca^(2+) lt Mg^(2+) lt Be^(2+)`
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