Electrolysis of aq. ${\mathrm{K}}_2{\mathrm{SO}}_4$ using inert electrodes is carried out by passing ‘N_A’ electrons. Volume of the gas obtained at cathode(at STP) is (N_A = Avogadro's number)

SRP value of ${\mathrm{E}}_{{\mathrm{H}}^{+}\left(\mathrm{aq}\right)/\frac{1}{2}{\mathrm{H}}_2(1 \mathrm{atm}), \mathrm{Pt}\left(\mathrm{s}\right)}^{\mathrm{o}}>{\mathrm{E}}_{{\mathrm{K}}^{+}\left(\mathrm{aq}\right)/\mathrm{K}\left(\mathrm{s}\right)}^0$

At cathode ${\mathrm{H}}_2$ gas is liberated

$$\begin{gathered} \therefore {\mathrm{W}}_{{\mathrm{H}}_2}=\frac{\mathrm{E}\times \mathrm{q}}{\mathrm{F}} \\ \mathrm{Charge} \mathrm{of} 6.023\times {10}^{23} \mathrm{electrons} =1 \mathrm{F} \\ {\mathrm{W}}_{{\mathrm{H}}_2}=\frac{1\times 96500}{96500} \\ {\mathrm{W}}_{{\mathrm{H}}_2}=1 \mathrm{g} \\ 2 \mathrm{g} \mathrm{of} \mathrm{hydrogen}....22.4 \mathrm{l} \mathrm{at} \mathrm{STP} \\ 1 \mathrm{g} \mathrm{of} \mathrm{hydrogen}....11.2 \mathrm{l} \mathrm{at} \mathrm{STP} \end{gathered}$$