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Question

Compound that formally contains Pb4+ are easily reduced to Pb2+. The stability of the lower oxidation state is due to:

A
inert pair effect
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B
ionic radius
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C
charge
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D
covalent character
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Solution

The correct option is A inert pair effect
As we go down the group in p-block, there is an increasing tendency for the s2 pair not to be used in bonding i.e. the s-electrons remain inert and do not participate in bonding. This is called an inert pair effect. Hence, the oxidation state is decreased by 2 and so Pb​2+ is found to be more stable than Pb4+.

Hence, the correct option is A

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