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A button cell used in watches functions as following
\( \mathrm{Zn}(\mathrm{s})+\mathrm{Ag}_{2} \mathrm{O}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \underset{2 \mathrm{Ag}(\mathrm{s})+\mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})}{\rightleftharpoons} \)
If half cell potentials are :
\( \mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Zn}(\mathrm{s}) ; \mathrm{E}^{\mathrm{o}}=-0.76 \mathrm{~V} \)
\( \mathrm{Ag}_{2} \mathrm{O}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{Ag}(\mathrm{s})+2 \mathrm{OH}^{-}(\mathrm{aq}) ; \mathrm{E}^{\mathrm{o}}=0.34 \mathrm{~V} \)
The cell potential will be :
(a) \( 0.42 \mathrm{~V} \)
(b) \( 0.84 \mathrm{~V} \)
(c) \( 1.34 \mathrm{~V} \)
(d) \( 1.10 \mathrm{~V} \)
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