What will be the $EMF$ of the cell formed by the following half-cells in $V$?
$Mg^{2+} + 2e^- \to Mg_{(s)}; E = -2.37 \ V$
$Cu^{2+} + 2e^- \to Cu_{(s)}; E = +0.33 \ V$

Which of the following is the weakest reducing agent?

The cell potential of a cell in operation is

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

Given below are the half-cell reactions: $Mn^{2+} + 2e^- \rightarrow Mn$ $(E^0 = -1.18 \text{ V})$; $Mn^{3+} + e^- \rightarrow Mn^{2+}$ $(E^0 = +1.51 \text{ V})$. The $E^0_{cell}$ for $3Mn^{2+} \rightarrow Mn + 2Mn^{3+}$ will be . . . . . .

For the reaction $Cr_2O_7^{2-} + I^- \to I_2 + Cr^{3+}$,if $E_{cell}^o = 0.79 \ V$ and $E_{Cr_2O_7^{2-}}^o = 1.33 \ V$,then $E_{I_2}^o = $ ............. $V$.