What is electrode potential?

Ferrous ion $(Fe^{2+})$ can be oxidised by which of the following ions?

Discuss the method to determine the cell potential of any cell when a standard hydrogen electrode is considered as the cathode with a suitable example.

The standard potential of a $Co^{2+} | Co$ electrode is $-0.28 \ V$ and the standard potential of the cell $Pt | Ti^{2+}(aq.), Ti^{3+}(aq.) || Co^{2+}(aq.) | Co_{(s)}$ is $0.09 \ V$. What is the standard potential of the $Ti^{2+}(aq.) | Ti^{3+}(aq.)$ electrode (in $V$)?

The reduction potential ($E^{\circ}$,in $V$) of $MnO_4^-{_{\text{(aq)}}} / Mn_{\text{(s)}}$ is. . . . . $[Given : E^{\circ}_{(MnO_4^{-(aq)} / MnO_{2(s)})} = 1.68 \ V ; E^{\circ}_{(MnO_{2(s)} / Mn^{2+}_{(aq)})} = 1.21 \ V ; E^{\circ}_{(Mn^{2+(aq)} / Mn_{(s)})} = -1.03 \ V]$

The standard hydrogen electrode has a zero electrode potential because .....