In view of the signs of Delta_(r)G^(@)for the following reactions : PbO_(2)+ Pb rarr 2PbO, Delta_(r)G^(@)lt 0 SnO_92)+Sn rarr2SnO, Delta_(r)G^(@) gt 0 Which oxidation states are more charactersitic for lead and tin?

In view of the signs of Delta_(r)G^(@)for the following reactions : Pb

1.	In view of the signs of Delta_(r)G^(@)for the following reactions : PbO_(2)+ Pb rarr 2PbO, Delta_(r)G^(@)lt 0 SnO_92)+Sn rarr2SnO, Delta_(r)G^(@) gt 0 Which oxidation states are more charactersitic for lead and tin?
Answer» For lead `+4`, for TIN `+2` For lead `+2`, for tin `+2` For lead `+4` for tin `+4` For lead `+2`, for tin`+4` Solution :`overset(+4)(PbO_(2))+Pb rarr overset(+2)(2PbO) `. As`Delta_(r)G^(@)lt 0`, i.e., it isnegative , thereaction is spontanoeus in the forward direction, i.e., `Pb^(+2)` is more stable than`Pb^(+4)` `overset(+4)(SnO_(2)) +SN rarr overset(+2)(2SnO)`. As `Delta_(r)G^(@) gt 0`, i.e., it ispositive,reverse reaction will be spotaneous , i.e., `Sn^(+4)` willbe morestable than`Sn^(+2)`. These facts are also supported by the INERT pair EFFECT down the group.