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NEETChemistryElectrochemistry

What is the overall reaction in a mercury cell?

Options

  1. AZn(Hg) + HgO(s) → ZnO(s) + Hg(l)
  2. BZn(Hg) + 2OH- → ZnO(s) + H2O + 2e-
  3. CHgO + H2O + 2e- → Hg(l) + 2OH-
  4. DZn(s) → Zn2+ + 2e-

Correct answer

A. Zn(Hg) + HgO(s) → ZnO(s) + Hg(l)

Step-by-step solution

The overall reaction for a mercury cell as Zn(Hg) + HgO(s) → ZnO(s) + Hg(l).

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