In view of the signs of `Delta_rG^@` for the following reactions
`PbO_2 + Pb to 2PbO, Delta_r G^@ lt 0`
`SnO_2 +Sn to 2SnO, Delta_rG^@ gt 0`
Which oxidation states are more characteristic for lead and tin?

Options

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

Answer

C

Explanation

Negative `Delta_(r)G^(@)` value indicates that `+2` oxidation state is more stable for `Pb^(2)`. Also it is supported by inert pair effect that `+2` oxidation state is more stable for Pb and `+4` oxidation state is more stable for Sn.