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The reactions taking place in the dry cell are:
Anode: \( \mathrm{Zn} \rightarrow \mathrm{Zn}^{2+}+2 \mathrm{e}^{-} \)
Cathode: \( 2 \mathrm{MnO}_{2}+2 \mathrm{NH}_{4}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mn}_{2} \mathrm{O}_{3}+ \) \( 2 \mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O} \)
The minimum mass of reactants, if a dry cell is to generate \( 0.25 \mathrm{~A} \) for \( 9.65 \mathrm{~h} \), are \( (\mathrm{Mn}=55, \mathrm{Zn}=65.4) \) (neglect any other chemical reactions occurring in the cell)
(a) \( 2.943 \mathrm{~g} \mathrm{Zn} \)
(b) \( 7.83 \mathrm{~g} \mathrm{MnO}_{2} \)
(c) \( 1.62 \mathrm{~g} \mathrm{NH}_{4}^{+} \)
(d) \( 3.915 \mathrm{~g} \mathrm{MnO}_{2} \)
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