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Question

Consider the reactions;

PbO2PbO, ΔG298<0;

SnO2SnO, ΔG298<0

The most probable oxidation state of Pb and Sn will be :


A
Pb4+,Sn2+
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B
Pb4+,Sn4+
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C
Pb2+,Sn3+
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D
Pb2+,Sn2+
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Solution

The correct option is D Pb2+,Sn2+
Since the free energy change is negative for both reactions, the reactions are spontaneous and occur in the forward direction.

Hence the most probable oxidation state of Pb and Sn will be the one which is present in products.

Hence +2 oxidation state will be most probable for Pb and Sn.

Option D is correct.

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