In view of the signs of `Delta_(r)G^(@)` for the following reactions :
`PbO_(2)+Pbto2PbO,Delta_(r)G^(@)lt0`
`SnO_(2)+Snto2SnO,Delta_(r)G^(@)gt0`,
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+) to Pb^(2+)`
or `Pb^(2+)` is more stable than `Pb^(4+)`
`DeltaG^@ gt 0` i.e. non-spontaneous
or `Sn^(4+) to Sn^(2+)`
So that `Sn^(4+)` is more stable than `Sn^(2+)`.