Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is D.

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Detailed Solution

We can study the effect of opposing potential applied to a galvanic cell as follows.

1) When Eexternal<1.1V
In a galvanic cell, if an external opposite potential is applied and increased slowly, we find that the reaction continues to take place till the opposing voltage reaches the value 1.1 V.
2) When Eexternal=1.1V
When the external voltage is 1.1V the reaction stops altogether and no current flows through the cell.
3) When Eexternal>1.1V
Any further increase in the external potential again starts the reaction but in the opposite direction. It now functions as an electrolytic cell, a device for using electrical energy to carry non-spontaneous chemical reactions.

In the Daniel cell, the zinc rod acts as the anode while the copper rod acts as a cathode.

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