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Question
Why does the cell potential of mercury cell remain constant throughout its life?
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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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(i) Which cell is used in hearing aids?
(ii) Which cell was used in Apollo Space Programme?
(iii) Which cell is used in automobiles and inverters?
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Name the type of cell which was used in Apollo space programme for providing electrical power.
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Mercury cell delivers a constant potential during its life time.
Which one of the following statements is correct regarding the dry cell?
(P) Zinc container acts as an anode in dry cell.
(Q) Zinc container touches the paste of MnO2 and carbon.
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