In which of the following electrochemical cell, overall cell reaction is: HgO(s) + H2 (g) → Hg(l) + H2O(l) ?
Correct answer: B. Mercury cell
- A. Alkaline battery
- B. Mercury cell
- C. Lead-acid battery
- D. Fuel cell
Explanation
The correct answer is the Mercury cell. In a mercury cell, the overall reaction is HgO(s) + H2(g) → Hg(l) + H2O(l), which matches the reaction given in the question. In this cell, mercury oxide is reduced by hydrogen, producing liquid mercury and water. The other options do not involve reactions between mercury oxide and hydrogen, making them incorrect choices for this specific reaction.
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