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Electrode Reactions in Dry Cell and Mercury Cell

Expert Answer

Dry Cell (Leclanché cell): • Anode: Zn(s)→Zn2++2e−Zn(s) \rightarrow Zn^{2+} + 2e^- • Cathode: MnO2+NH4++e−→MnO(OH)+NH3MnO_2 + NH_4^+ + e^- \rightarrow MnO(OH) + NH_3 Mercury Cell: • Anode: Zn(Hg)+2OH−→ZnO(s)+H2O+2e−Zn(Hg) + 2OH^- \rightarrow ZnO(s) + H_2O + 2e^- • Cathode: HgO+H2O+2e−→Hg(l)+2OH−HgO + H_2O + 2e^- \rightarrow Hg(l) + 2OH^-

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