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A variable, opposite external potential (Eext) is applied to the cell ZnZn2+(1M)Cu2+(1M)Cu of potential 1.1 V. When Eext <1.1V and Eext >1.1V respectively, electrons flow from:

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a
anode to cathode and cathode to anode
b
cathode to anode and anode to cathode
c
cathode to anode in both cases
d
anode to cathode in both cases

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detailed solution

Correct option is A

The cell will function as a galvanic cell if Eext<1.1V,  at which point electrons will flow from the anode to the cathode.

Eext >1.1V, causes electrons to flow from cathode to anode, causing the cell to function as an electrolytic cell.

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