Which defines the standard reduction electrode potential of `Zn^(2+)` ions

Options

A. `Zn^(2+) (aq) + 2 e^(-) to Zn(s) , [Zn^(2+)] = 1 M`
B. `Zn(g) to Zn^(2+) + 2e^(-) , [Zn^(2+)] = 1 M`
C. `Zn^(2+) (aq) to Zn(s) + 2e^(-) , [ Zn^(2+)] = 1 M`
D. `Zn^(2+) (g) + 2 e^(-) to Zn(s) - 2e^(-) , [Zn^(2+)] = 1 M`

Answer

A

Explanation

`E^(@) = E ` , when `[Zn^(2+)] = 1M`,
Also process is `Zn^(2+) (aq) + 2e to Zn(s)`