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Question

PbCl4 is less stable then SnCl4, PbCl2 is more stable then SnCl2. Give reasons.

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Solution

The stability of higher oxidation state decreases down the group whereas the stability of lower oxidation state increases down the group.This trend is the consequence of inert pair effect due to which two electron of lead in s-orbital do not participate in chemical bonding.Hence Pb shows +2 oxidation state predominantly.
Whereas no such effect occurs in Sn and hence it prefer to form SnCl4 in comparison of SnCl2

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