Question

Why PbCl2 is more stable than SnCl2 ?

Answer 1

As we go down the group, +2 oxidation state becomes more favorable and stable. Since Pb is more down the group than Sn, it's stable with +2 oxidation state where Sn can exhibit both +2&+4 but +4 is more stable due to which SnCl2 is a strong reducing agent.

Answer 2

in pbCl2 oxidation state of pb is +2 and in SnCl2 oxidation state of Sn is also +2
.but you know in +2 oxidation state pb is more stable then Sn , due to innert pair effect , if we goes to down the group stability of +2 oxidation state increase.henc, pbCl2 is more stable then SnCl2