Which cell will measure standard electrode potential of copper electrode ?

Options

A. `Pt_((S))|H_(2(g,0.1" bar"))|H_((aq,1M))^(+)||Cu_((aq,1M))^(2+)|Cu`
B. `Pt_((S))|H_(2(g,1" bar"))|H_((aq,1M))^(+)||Cu_((aq,2M))^(2+)|Cu`
C. `Pt_((S))|H_(2(g,1" bar"))|H_((aq,0.1M))^(+)||Cu_((aq,1M))^(2+)|Cu`
D. `Pt_((S))|H_(2(g,1" bar"))|H_((aq,1M))^(+)||Cu_((aq,1M))^(2+)|Cu`

Answer

C

Explanation

`underset("Standard Hydrogen electrode, "H_(2)" gas and standard pressure is 1 bar".)ubrace(Pt_((S))|H_(2(g,"1 bar"))|H_((aq,1M))^(+))||underset("Standard copper electrode. "Cu_((aq))^(2+)=1M)ubrace(Cu_((aq,1M))^(2+)|Cu)`
* To measure the electrode potential of any electrode, the concentration in half cell must be 1 M and pressure of gas should be 1 bar.