Advertisements
Advertisements
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.
APPEARS IN
RELATED QUESTIONS
Draw neat and labelled diagram of dry cell.
Write cell reaction in lead storage battery during discharge.
What type of battery is mercury cell? Why is it more advantageous than dry cell?
Name the type of cell which was used in Apollo space programme for providing electrical power.
Define terms: Fuel cell
Define the following terms: Secondary batteries
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.
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.
Dry cells are commonly used in clocks, torches, calculators etc. They are the most familiar type of commercial cells.
- What acts as anode and cathode in dry cell?
- Which chemical compounds are filled between anode and cathode of this cell?
- Why do dry cells not have a long life?
