The standard reduction potentials of `Cu^(2+)|Cu` and `Cu^(2+)|Cu^(o+)` are `0.337V` and `0.153V`, respectively. The standard electrode potential fo `Cu^(o+)|Cu` half cell is

Options

A. 0.184V
B. 0.827V
C. 0.521
D. 0.490V

Answer

C

Explanation

We have, ltBrgt
From the half-cell reactions, it follows that
`DeltaG_(3)^(o)=DeltaG_(1)^(o)-DeltaG_(2)^(o)` i.e., `-FE_(Cu^(2+)//Cu)^(o)=-2FE_(Cu^(2+)//Cu)^(o)-(-FE_(Cu^(2+)//C^(+))^(o))`
or `E_(Cu^(+)//Cu)^(o)=2E_(Cu^(2+)//Cu)^(o)-E_(Cu^(2+)//Cu^(+))^(o)=2(0.337V)-0.153V=0.521V`.