JEE MAIN - Chemistry (2007 - No. 34)
The charge/size ratio of a cation determines its polarizing power. Which one of the following
sequences represents the increasing order of the polarizinig order of the polarizing power of the
cationic species, K+, Ca2+, Mg2+, Be2+?
Mg2+ < Be2+ < K+ < Ca2+
K+ < Ca2+ < Mg2+ < Be2+
Be2+ < K+ < Ca2+ < Mg2+
Ca2+ < Mg2+ < Be2+
< K+
Selitys
As charge/size ratio of a cation determines its polarizing power so high charge and small size of the cations increases
polarisation.
As the size of the given cations decreases as
K+ > Ca2+ > Mg2+ > Be2+
Hence, polarising power decreases as
K+ < Ca2+ < Mg2+ < Be2+
As the size of the given cations decreases as
K+ > Ca2+ > Mg2+ > Be2+
Hence, polarising power decreases as
K+ < Ca2+ < Mg2+ < Be2+