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

Options

A. `Mg^(2+)lt Be^(2+)lt K^(+)lt Ca^(2+)`
B. `Be^(2+)lt K^(+)lt Ca^(2+)lt Mg^(2+)`
C. `K^(+)lt Ca^(2+)lt Mg^(2+)lt Ba^(2+)`
D. `Ca^(2+)lt Mg^(2+)lt Be^(2+)lt K^(+)`

Answer

C