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+)`

Options

A. `Ca^(2+)lt Mg ^(2+) lt Be ^(2+)lt K^(+)`
B. `Bg ^(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+)`

Answer

D

Explanation

The increasing order of the polarising power (charge/size ratio) is `K^(+)lt Ca^(2+) lt Mg^(2+) lt Be ^(2+).`