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Question

PbO2------ PbOΔG298<0
SnO2-------SnO ΔG298>0
Most probable oxidation state of Pb & Sn will be :

A
Pb+4,Sn+4
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B
Pb+4,Sn+2
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C
Pb+2,Sn+2
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D
Pb+2,Sn+4
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Solution

The correct option is C Pb+2,Sn+4
For Pb it will be +2 as ΔG298 of PbO<0. (Spontaneous formation or more stable).
For Sn it will be +4 as ΔG298 of SnO>0. (Non- spontaneous formation or less stable).

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