1.

In view of the signs of DeltaG^(ө) for the following reactions, PbO_(2)+Pb to 2PbO,Delta_(r)G^(ө) lt 0, SnO_(2)+Snto 2SnO,Delta_(r)G^(ө) gt 0 Which oxidation states are more characteristic for lead and tin?

Answer»

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

Solution :`overset(+4)(Pb)O_(2)+overset(0)(Pb) to 2 overset(+2)(Pb)O`
Since, `Delta_(r)G^(@) lt 0`, HENCE +2 state of lead is favourable.
`overset(+4)+(SN)O_(2)+overset(0)(Sn) to 2 overset(0)(Sn)O`
Since, `Delta_(r)G^(@)gt0` it means forward reaction is not spontaneous.
`2overset(+2)(Sn)O+overset(+4)(Sn)O_(2) to 2overset(0)(S)n`
`Delta_(r)G^(@) lt0`, thus +4 state of tin is favourable.


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