In view of the signs of `Delta_rG^@` for the following reactions :
`PbO_2 +Pb rarr 2PbO,Delta_rG^@ lt 0`
`SnO_2 +Sn rarr 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, for tin +4
D. For lead +4 ,for tin +2

Answer

C

Explanation

`DeltaG^@ lt 0` so that `Pb^(4+) rarr Pb^(2+)`
or `Pb^(2+) ` is more stable than `Pb^(4+)`
`DeltaG^@ gt 0` i.e., nonspontaneous
so that `Sn^(4+)` is more stable than `Sn^(2+)`.