(આપેલ : $E _{ Zn ^{2+} \mid Zn }^{ o }=-0.763 V , E _{ Sn ^{x+} \mid Sn }^{ O }=+0.008 V$ ધારી લો $\frac{2.303 RT }{ F }=0.06\, V$ )
$F{e^2}+ \left( {aq} \right) + A{g^ + }\left( {aq} \right) \to F{e^{3 + }}\left( {aq} \right) + Ag\left( s \right)$
$E_{Ag^+/Ag}^o = xV$, $E_{F{e^{2 + }}/Fe}^o = yV$, $E_{F{e^{3 + }}/Fe}^o = zV$