In view of the signs of `Delta_(r)G^(@)` for the following reactions:
` PbO_(2)+Pb to 2PbO, Delta_(r)G^(@)`
`SnO_(2)+S to 2SnO, Delta_(r)G^(@)`
Which oxidation states are more characteristics for lead and tin?

Options

A. For lead +2, For tin +2
B. For lead +4, for tin +4
C. For lead +2, For tin +4
D. For lead +4, For tin +2

Answer

C

Explanation

Negative `Delta_(r)G^(@)` value of indicates that +2 oxidation state is more stable for Pb. Also it is supported by inert pair effect that +2 oxidation state is more stable for Pb and as `Delta_(r)G^(@)` value is positive in second reaction it indicates that +4 oxidation state is more stable for Sn i.e., `Sn^(2+)ltPb^(2+), S^(4+)gtPb^(4+)`