Question

The EMF of the Daniell cell is 1.1V . The external EMF to be applied for the following reaction to take place in it is:

A

1.0 V

B

1.1 V

C

1.2 V

D

0.55 V

Hard

Solution

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Correct option is C)

The emf of the Daniell cell is . If an emf just smaller than that of the cell is applied, the reaction taking place in the cell is:

At anode:

At cathode:

Overall reaction

We need the reaction to take place in reverse direction then the external emf should be just greater than cell emf. Therefore, the answer is .Β 

Option C is correct.

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