Question

Which is the increasing order of polarizing power ?

a) Ca+2 < Mg+2 < Be+2 < K+

b) Mg+2 < Be+2
< K+ < Ca+2

c) Be+2 < K+ < Ca+2 < Mg+2

d) K+ < Ca+2 < Mg+2 < Be+2​

Answer 1

K+ < Ca+2 < Mg+2 < Be+2

Explanation:

Size of dipositive alkaline earth metal ions increases as we move down the group. Thus, increase in the order of charge density and, hence, polarizing power is K+<Ca2+<Mg2+<Be2+.