Content not found (A) \( \mathrm{MnO}_{2}+\mathrm{NH}_{4}^{+}+\mathrm{e}^{-} \rightarrow \mathrm...
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(A) \( \mathrm{MnO}_{2}+\mathrm{NH}_{4}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{MnO}(\mathrm{OH})+\mathrm{NH}_{3} \)
(B) \( \operatorname{Zn}^{2+}{ }_{(\mathrm{aq})}+2 e^{-} \rightarrow 2 \mathrm{n}_{(\mathrm{s})} \)
(C) \( \mathrm{Zn}_{(\mathrm{S})} \rightarrow \mathrm{Zn}_{(\mathrm{aq})}^{2+}+2 e^{-} \)
(D) \( \mathrm{Zn}_{(\mathrm{Hg})}+20 \mathrm{H}^{-} \rightarrow \mathrm{ZnO}_{(\mathrm{s})}+\mathrm{H}_{2} \mathrm{O}+2 \mathrm{e}^{-} \)
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