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प्रश्न
Why does the cell potential of mercury cell remain constant throughout its life?
उत्तर
- 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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संबंधित प्रश्न
Draw neat and labelled diagram of dry cell.
Write cell reaction in lead storage battery during discharge.
Define electrochemical cell
From the given cells:
Lead storage cell, Mercury cell, Fuel cell and Dry cell
Answer the following:
(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?
(iv) Which cell does not have long life?
Name the type of cell which was used in Apollo space programme for providing electrical power.
Define terms: Fuel cell
In the button cells widely used in watches and other devices, the following reaction takes place:
\[\ce{Zn_{(s)} + Ag2O_{(s)} + H2O_{(l)} -> Zn^{2+}_{( aq)} + 2Ag_{(s)} + 2OH^-_{( aq)}}\]
Determine ΔrGΘ and EΘ for the reaction.
Without losing its concentration; ZnCl2 solution cannot be kept in contact with
Why does the cell voltage of a mercury cell remain constant during its lifetime?
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.
(R) Dry cell can be charged easily.
(S) Graphite rod acts as a cathode in dry cell.
