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Comprehension
The Edison storage cell is represented as \( \mathrm{Fe}(\mathrm{s})|\mathrm{FeO}(\mathrm{s})| \mathrm{KOH}(\mathrm{aq})\left|\mathrm{Ni}_{2} \mathrm{O}_{3}(\mathrm{~s})\right| \mathrm{NiO}(\mathrm{s}) \mid \mathrm{Ni}(\mathrm{s}) \). The half-cell reactions are
\[
\begin{array}{l}
\mathrm{Ni}_{2} \mathrm{O}_{3}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{e} \rightleftharpoons 2 \mathrm{NiO}(\mathrm{s})+2 \mathrm{OH}^{-} ; E^{\circ}=+0.40 \mathrm{~V} \\
\mathrm{FeO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{e} \rightleftharpoons \mathrm{Fe}(\mathrm{s})+2 \mathrm{OH}^{-} ; E^{\circ}=-0.87 \mathrm{~V}
\end{array}
\]
What is the standard cell EMF?
(a) \( 1.27 \mathrm{~V} \)
(b) \( 0.47 \mathrm{~V} \)
(c) \( -1.27 \mathrm{~V} \)
(d) \( -0.47 \mathrm{~V} \)
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