The half cell reactions are $Ni_2O_3(s)+H_2O(l)+2e^-\rightarrow 2NiO(s)+2OH^-(aq)\Rightarrow E^0=0.4V$,
$FeO(s)+H_2O(l)+2e^-\rightarrow Fe(s)+2OH^-(aq)\Rightarrow E^0=-0.87.V$.What is cell reaction?
$\begin{array}{1 1}(a)\;Ni_2O_3+H_2O\rightarrow 2NiO+2OH^-\\(b)\;Fe+Ni_2O_3\rightarrow FeO+2NiO\\(c)\;FeO+H_2O+2e^-\rightarrow Fe+2OH^-\\(d)\;None\end{array}$
