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

Answer

D

Explanation

Since `Delta _rG^(@) ` is - ve for first reaction, therefore, +2 oxidation state of Pb is more stable. Further since ` Delta _r G^(@) ` is + ve for second reaction, therefore, + 4 oxidation state of Sn is more stable. Thus, option (d) is correct.