In a mercury cell, what is the overall cell reaction?

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Zn + HgO + H₂O → ZnO + Hg + OH⁻ Zn + 2HgO → ZnO + Hg₂ Zn + Hg²⁺ → Zn²⁺ + Hg Zn + HgO → ZnO + Hg Correct

Anode: Zn + 2OH⁻ → ZnO + H₂O + 2e⁻ . Cathode: HgO + H₂O + 2e⁻ → Hg + 2OH⁻ . Overall: Zn + HgO → ZnO + Hg .

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