The standard reduction potential of ` Cu^(2+) // Cu and Cu^(+) // Cu ` are 0.337 and 0.153 V respectively . The standard electrode poetential of `Cu^(2+) // Cu^(+)` half cell will be

Options

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

Answer

C

Explanation

(1) `Cu^(+2) + 2e^(-) to Cu , (2 xx 0.337) ` (2)` Cu^(+1) + 1e^(-) to Cu, (1 xx 0.153)`
(3) `Cu^(+2) + 1e^(-) to Cu^(+) , (1 xx E_3^(0)) ` ,(3) = (1)-(2)
` 1 xx E_(3)^(0) = (2 xx 0.337) -(1 xx 0.153) , E_3^(0) = 0.674 - 0.153 = 0.521`