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Cu^(+) (aq) is unstable in solution an...

`Cu^(+)` (aq) is unstable in solution and undergoes simultaneous oxidation and reduction according to the reaction `2cu^(+)(Aq)rarrCu^(2+)(aq)+cu(s)`
choose correct `E^(2)` for above reaction if
`E_(Cu^(2+)//Cu)^(@) =0.34 V` and `E_+(Cu^(2+)//Cu^(+))^(2)` =0.15 V`

A

`-0.38 V`

B

`+0.49 V`

C

`+0.38 V`

D

`-0.19 V`

Text Solution

Verified by Experts

The correct Answer is:
C
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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