1.

Cu^(+) (aq) is unstablein solutionand undergoessimultaneous oxidationand reduction according to the reaction 2cu^(+)(Aq)rarrCu^(2+)(aq)+cu(s) choose correct E^(2)for above reactionif E_(Cu^(2+)//Cu)^(@) =0.34 V and E_+(Cu^(2+)//Cu^(+))^(2) =0.15 V

Answer»

`-0.38 V`
`+0.49 V`
`+0.38 V`
`-0.19 V`

Solution :From given data (suign `TRIANGLE G^(2)=- nFE_(cell)^(@)`
`(i) Cu (s) rarr Cu^(2+) (aq)+2E^(-)`
`triangle G_(1)^(2)=-2xx(-0.34)xxxF`
`(ii) Cu^(2+) +(aq)+e^(-) rarr Cu^(+) (aq).triangle G_(2)^(@)=- 1xx(0.15)"F on addition"`
`Cu(s) rarr Cu^(+) (aq) +e^(-) triangleG_(3)^(@) =- 1xxE^(@)xxF`
`triangle G_(3)^(2)=triangleG_(1)^(2)+triangle_(2)^(@)=(-2xx0.34 xxF)+(-1xx0.15 xxF)`
`=+0.68 F-0.15 F` or `E^(@)=- 0.53 V`


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