Question

The $SRP$ values of $Ag$${}^{+}$/$Ag$ and $Zn$${}^{2+}$/$Zn$ electrodes are $0.80$ and $-0.76$. In the cell build with these two electrode:

• A. Ag electrode acts as anode and $Zn$ electrode acts as cathode
• B. Ag electrode acts as cathode and $Zn$ electrode acts as anode
• C. both the electrodes act as cathode
• D. the cell cant be built with these two electrodes

Answer 1

Answer: (B)

Ag electrode acts as cathode and $Zn$ electrode acts as anode

For the cell,
$SRPofA{g}^{+}>$ $SRP$ of $Z{n}^{2+}$

$\therefore A{g}^{+}$ should get reduced and $Zn$ should get oxidised

Hence $Ag$ acts as the cathode and $Zn$ acts as an anode.

Hence, option B is correct.