Select the correct statement

Which has maximum potential for the half-cell reaction?

$2{\mathrm{H}}^{+}+2{\mathrm{e}}^{-}⟶{\mathrm{H}}_2$

Consider the following equations for a cell reaction:

$\mathrm{A}+\mathrm{B}⟶\mathrm{C}+\mathrm{D} ; \mathrm{E}°=\mathrm{x} \mathrm{volt},\mathrm{\Delta G}={\mathrm{\Delta G}}_1$

$2 \mathrm{A}+2 \mathrm{B}⟶2\mathrm{C}+2\mathrm{D}; \mathrm{E}°=\mathrm{y}$ volt, $\mathrm{\Delta G}={\mathrm{\Delta G}}_2$

Then,

Calculate $\mathrm{\Delta G}°$ for the galvanic cell:

$2\mathrm{Cr}\left(\mathrm{s}\right)+3{\mathrm{Cd}}^{+2}\left(\mathrm{aq}\right)⟶2{\mathrm{Cr}}^{+3}\left(\mathrm{aq}\right)+3\mathrm{Cd}\left(\mathrm{s}\right)$

${\mathrm{E}}_{{\mathrm{Cr}}^{+3}/\mathrm{Cr}}^0=-0.74 \mathrm{V},{\mathrm{E}}_{{\mathrm{Cd}}^{+2}/\mathrm{Cd}}^0=-0.40 \mathrm{V}$