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Why does the cell potential of mercury cell remain constant throughout its life? - CBSE (Science) Class 12 - Chemistry

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Question

Why does the cell potential of mercury cell remain constant throughout its life?

Solution

  • A mercury cell consists of a zinc container as the anode, a carbon rod as the cathode and a paste of mercuric oxide mixed with KOH as the electrolyte.
  • In this cell, the overall cell reaction does not involve any ion whose concentration may change.
  • Therefore, this cell gives a constant potential of 1.5 V throughout its life.
  • However, these cells should be reprocessed for mercury recovery or treated to prevent mercury or mercury compounds from entering the atmosphere and causing pollution.
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Solution Why does the cell potential of mercury cell remain constant throughout its life? Concept: Batteries - Primary Batteries.
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