$E _{ FeO _4^{2-} / Fe ^{2+}}^\theta$ એ $x \times 10^{-3} V$. તો $x$ નું મૂલ્ય $.........$.છે.
${[Fe\,{(CN)_6}]^{4 - }}\, \to \,{[Fe{(CN)_6}]^{3 - }}\, + \,{e^ - }\,;\,$ ${E^o}\, = \, - \,0.35\,V$
$\,F{e^{2 + }}\, \to \,F{e^{3 + }}\, + \,{e^ - }\,;$ ${E^o}\, = \, - \,0.77\,V$