Question

`Cu^(+)` ion is not stable in aqueous solution because because of dispropotionation reaction. `E^(@)` value of disproportionation of `Cu^(+)` is
`[E_(Cu^(2+)//Cu^(+))^(@)=+ 0.15 V, E_(Cu^(2+)//Cu)^(@)=0.34 V]`
A. `-0.38 V`
B. `+ 0.19 V`
C. `-0.49 V`
D. `+ 0.38 V`

Answer 1

Correct Answer - B
The reaction of disproportionation is
`2Cu^(+) rarr Cu^(2+) +Cu`
`:. E_(Cu^(+)//Cu^(2+))^(@)=E_(Cu^(+)//Cu^(2+))^(@)+E_(Cu^(2+)//Cu)^(@)`
`=(-E_(Cu^(2+)//Cu^(+))^(@))+E_(Cu^(2+)//Cu)^(@)`
`=-0.15+0.34=+ 0.19 V`