Out of pb +4 and sn +2 which has more polarising power
Size of cation : Smaller the size of cation, smaller is its polarsing power.
Charge on cation : As the charge on cation increases, its polarising power increases.
so the polarising power of PB+4 is greater than the Sn2+
will have more polarising power than .
The first rule of Fazan's explains the polarisation power of a cation.
It explains that the smaller the size of the cation and the higher the charge on the cation higher will be polarisation power.
Since has 4+ charge and has 2+ charge.
The size of is smaller than .
Therefore, polarising power of is more than .