How the stability of the oxidation states of group IV element vary down the group. (Illustrate your answer with the chloride of carbon and lead) 

How the stability of the oxidation states of group IV element vary down the group. (Illustrate your answer with the chloride of carbon and lead) 

Oxidation state +2 become more stable down the group

Oxidation state +4 become less stable down the group.

This can be illustrated by chlorides of carbon and lead as follows:

CCl4 is stable whereas PbCl4  easily decomposes on heating giving lead (II) chloride and chlorine

PbCl4 (g) (heat) →PbCl2 (s) + Cl2 (g)

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