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A button cell used in watches function as following \( \mathrm{Zn}(\mathrm{s})+\mathrm{Ag}_{2} \mathrm{O}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\ell) \rightleftharpoons 2 \mathrm{Ag}(\mathrm{s})+\mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq}) \)
\( \mathrm{P} \)
If half cell potentials are
W
\[
\begin{array}{l}
\mathrm{Zn}^{2+}(\mathrm{aq})+2 e^{-} \rightarrow \mathrm{Zn}(\mathrm{s}) ; \mathrm{E}^{\circ}=-0.76 \mathrm{~V} \\
\mathrm{Ag}_{2} \mathrm{O}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\ell)+2 e^{-} \rightarrow 2 \mathrm{Ag}(\mathrm{s})+2 \mathrm{OH}^{-}(\mathrm{aq}) \\
\mathrm{E}^{\circ}=0.34 \mathrm{~V}
\end{array}
\]
The standard cell potential will be :-
(1) \( 1.34 \mathrm{~V} \)
(2) \( 1.10 \mathrm{~V} \)
(3) \( 0.42 \mathrm{~V} \)
(4) \( 0.84 \mathrm{~V} \)
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