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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:

Cu(s)+Zn(aq)2+Cu(aq)2++Zn(s)


A
1.0 V
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B
1.1 V
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C
1.2 V
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D
0.55 V
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Solution

The correct option is C 1.2 V
The emf of the Daniell cell is 1.1V. If an emf just smaller than that of the cell is applied, the reaction taking place in the cell is:

At anode: ZnZn2++2e

At cathode: Cu2++2eCu

Overall reaction Zn+Cu2+Zn2++Cu

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 1.2V.

Option C is correct.

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