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Question

A variable, opposite external potential (Eext) is applied to the cell
Zn|Zn2+(1M)||Cu2+(1M)|Cu, of potential 1.1 V. When Eext < 1.1 V amd Eext > 1.1 V respectively electron flow from:

A
cathode to anode in both cases
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B
anode to cathode and cathode to anode
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C
anode to cathode in both cases
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D
cathode to anode and anode to cathode
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Solution

The correct option is D anode to cathode and cathode to anode
When Eext<1.1 V, the electrons will flow from anode to cathode, the cell will act as the galvanic cell.

when Eext>1.1 V, electrons will flow from cathode to anode and the cell will act as electrolytic cell.

Hence, option B is correct.

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