Which cell will measure standard electrode potential of copper electrode ?

Options

A. `Pt(s)|H_(2)("g, 0.1 bar")|H^(+)(aq, 1M)|Cu^(2+)(aq, 1M)|Cu(s)`
B. `Pt(s)|H_(2)("g, 1bar")|H^(+)(aq, 1M)|Cu^(2+)("aq, 2M")|Cu(s)`
C. `Pt(s)|H_(2)("g, 1bar")|H^(+)(aq, 1M)|Cu^(2+)("aq, 1M)|Cu(s)`
D. `Pt(s)|H_(2)("g, 1bar")|H^(+)(aq, 0.1M)|Cu^(2+)("aq, 1M")|Cu(s)`

Answer

C

Explanation

To calculate the standard electrode potential of the given cell it is coupled with the standard hydrogen electrode in which pressure of hydrogen gas is 1 bar and the concentration of `H^(+)` ions in the solution is 1 M and also the concentration of the oxidised and the reduced forms of the species in the right hand half - cell are unity.