Amongst the following electrodes,the one with zero electrode potential is

Can $E_{cell}^o$ or $\Delta_r G^o$ for a cell reaction ever be equal to zero?

What happens to the Gibbs free energy in a spontaneous electrochemical process?

Which metal does not give the following reaction? $M + \text{water} \rightarrow \text{oxide or hydroxide} + H_2$

Give the symbolic representation of the following half-cells (electrodes):
$(i)$ $Zn_{(s)} | Zn^{2+}_{(aq)} (1M)$
$(ii)$ $Cu^{2+}_{(aq)} (1M) | Cu_{(s)}$
$(iii)$ $Pt_{(s)} | H_{2(g)} (1 \text{ bar}) | H^+_{(aq)} (1M)$

What is the oxidation and reduction potential of standard hydrogen electrode?