1.

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 ?

Answer»

For lead +2 for TIN +2
For lead +4, for tin +4
For lead +2, for tin +4
For lead +4 ,for tin +2

Solution :`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+)`.


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