$[Fe(CN)_6]^{4-} \rightarrow [Fe(CN)_6]^{3-} + e^{-1}\, ;$ $ E^o = -0.35\, V$
$Fe^{2+} \rightarrow Fe^{3+} + e^{-1}\ ;$ $E^o = -0.77\, V$
The substance which has lower reduction potential are stronger reducing agent while the substances which have higher reduction potential are a stronger oxidising agent.
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}+\mathrm{e}^{-} \rightarrow\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4} ; \mathrm{E}^{\circ}=0.35 \mathrm{V}$
$\mathrm{Fe}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Fe}^{2+} ; \quad \mathrm{E}^{\circ}=0.77 \mathrm{V}$
The reduction potential of $\mathrm{F} \mathrm{e}^{3+/} \mathrm{Fe}^{2+}$ is higher, hence, $\mathrm{Fe}^{3+}$ is a strongest oxidising agent.
$F{e^2}+ \left( {aq} \right) + A{g^ + }\left( {aq} \right) \to F{e^{3 + }}\left( {aq} \right) + Ag\left( s \right)$
$E_{Ag^+/Ag}^o = xV$, $E_{F{e^{2 + }}/Fe}^o = yV$, $E_{F{e^{3 + }}/Fe}^o = zV$
$2 \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{O}_{2}+4 \mathrm{H}^{\oplus}+4 \mathrm{e}^{-} ; \mathrm{E}_{\mathrm{red}}^{0}=1.23 \mathrm{V}$ 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)
$Cd^{2+}_{(aq)} + 2e^{-} \rightarrow Cd(s),$ $E^o = -0.40\, V, $
$ Ag^{+}(aq) + e- \rightarrow Ag(s),$ $ E^o = 0.80\, V$ પ્રક્રિયા માટે પ્રમાણિત મુક્ત ઊર્જા પરિવર્ત પ્રક્રિયા $2 Ag^{+}(aq) + Cd(s) \rightarrow 2 Ag (s) + Cd^{2+}(aq)$ માટે કેટલા ............... $\mathrm{KJ}$ થાય?