MHT CET 2026 Chemistry question

Which from following statements regarding mercury battery is NOT true?

(A)It is a secondary dry cell.
(B)It consists of Zn anode amalgamated with mercury.
(C)The electrolyte is strongly acidic .Correct
(D)In this Hg is obtained by reduction of HgO

Answer: (C)

Solution

The mercury cell is a primary (non-rechargeable) dry cell used in watches, hearing aids and cameras. Its anode is zinc amalgamated with mercury, the cathode is a paste of HgO and carbon, and the electrolyte is a paste of KOH and ZnO, which is strongly alkaline, not acidic. At the cathode HgO is reduced to mercury:

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Question ID VK-098628