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The Edison storage cell is represented a...

The Edison storage cell is represented as,
`Fe_((s))|FeO_(S)||KOH_((aq.))||Ni_(2)O_(3(S))|No_((S))`
the half-cell reactions are :
`Ni_(2)O_(3(S))+H_(2)O_((l))+2e^(-)rarr 2NiO_((S))+2OH^(-) , E^(@)=+0.40V`
`FeO_((S))+H_(2)O_((I))+2e^(-)rarr Fe_((S))+2OH^(-) , E^(@)=-0.87V`
(i) What is the cell reaction ?
(ii) What is the cell e.m.f. ? How does ir depend on the concentration of KOH ?
(iii) What is the maximum amount of electrical energy that can be obtained from one mole of `Ni_(2)O_(3)` ?

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