The standard reduction potential of `Cu^(2+)//Cu` and `Cu^(2+)//Cu^(+)` are `0.339 V` and `0.153 V` respectively. The standard electrode potential of `Cu^(+)//Cu` half cell is :

Options

A. `- 0.34 ` V
B. `1.26 V `
C. `-1.26 V`
D. `0.34 V `

Answer

D

Explanation

`E_(cell)^(@) = E_((Ag^(+) |Ag))^(@) - E_((Cu^(2+) |Cu))^(@)`
`0.46 = 0.80 - E_((Cu^(2+) |Cu))^(@)`
`therefore E_((Cu^(2+) |Cu))^(@) = 0.80 - 0.46 = 0.34 V`