$\frac{l}{A}= \,\,\,1.29\,\,c{m^{ - 1}}$
$=\frac{1}{R}\times \left( \frac{\ell }{A} \right)\times \frac{1000}{Molarity}$
$=\frac{1}{500}\times 1.29\times \frac{1000}{0.02}$
$=124.03\,Sc{{m}^{2}}mol{{e}^{-1}}$
$\because \,1\,c{{m}^{2}}={{10}^{-4}}\,{{m}^{2}}$
$\therefore {{\wedge }_{m}}=124.03\times {{10}^{-4}}\,S\,c{{m}^{2}}mol{{e}^{-1}}$
$2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{\oplus}+4 \mathrm{e}^{-} ; \mathrm{E}_{\mathrm{red}}^{0}=1.23 \mathrm{V}$ અને $ - 5 \times {10^{ - 4}}\,V\,{K^{ - 1}}$ છે. કોષપ્રક્રિયા $(\mathrm{R}=8.314 \;\mathrm{J} \mathrm{mol}^{-1} \mathrm{K}^{-1} ; \text { Temperature }=298 \;\mathrm{K} ;$ ઓક્સિજન એ પ્રમાણિત વાતાવરણ દબાણ $1$ બાર હેઠળ છે)
$F{e^2}+ \left( {aq} \right) + A{g^ + }\left( {aq} \right) \to F{e^{3 + }}\left( {aq} \right) + Ag\left( s \right)$
$E_{Ag^+/Ag}^o = xV$, $E_{F{e^{2 + }}/Fe}^o = yV$, $E_{F{e^{3 + }}/Fe}^o = zV$
${{\text{E}}^o }{\text{C}}{{\text{u}}^{{\text{2}} + }}{\text{/Cu = + 0}}{\text{.34 V, E}}_{{\text{F}}{{\text{e}}^{ + {\text{2}}}}/Fe}^o = \,\,{\text{ - 0}}{\text{.44 V}}$