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MHT CET202615 April 2026Morning ShiftChemistryElectrochemistryActual

Which from following statements regarding mercury battery is NOT true?

Options

  1. AIt is a primary dry cell.
  2. BIt consists of Zn anode amalgamated with mercury.
  3. CThe electrolyte is strongly acidic.
  4. DIn this Hg is obtained by reduction of HgO

Correct answer

C. The electrolyte is strongly acidic.

Step-by-step solution

A mercury battery is a primary dry cell. The anode consists of zinc amalgamated with mercury, Zn(Hg) . The cathode is a paste of HgO and carbon, where HgO is reduced to Hg during the operation of the cell. The electrolyte is a paste of KOH and ZnO . Since KOH is a strong base, the electrolyte is strongly alkaline, not acidic. Therefore, the statement that the electrolyte is strongly acidic is incorrect. Answer: The electrolyte is strongly acidic.

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