| ASSERTION: Leclanche cell is used when constant supply of electric current is not required. |
| REASON: The e.m.f. of a Leclanche cell falls, if it is used continuously. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
The e.m.f. of a leclanche cell falls, because of the partial polarization due to accumulation of hydrogen gas. In case, leclanche cell is used in experiment, where current is drawn after short breaks, then during each break, hydrogen gas escapes and \[Mn{{O}_{2}}\]by taking oxygen from the atmosphere. As a result, the cell regains its original e.m.f.
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