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What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell’s potential?

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in Chemistry – Class 12 by (188k points)
What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell’s potential?

(a) The electrochemical cell behaves like an electrolytic cell

(b) The electrochemical cell stops functioning

(c) Only oxidation reactions occur in the cell

(d) Only reduction reactions occur in the cell

I have been asked this question in exam.

My question is from Electrochemical Cells topic in chapter Electrochemistry of Chemistry – Class 12

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The correct choice is (a) The electrochemical cell behaves like an electrolytic cell

The explanation is: In an electrochemical cell, when an opposing externally potential is applied and increased slowly, the reaction continues to take place. When the external potential is equal to the potential of the cell, the reaction stops. Once the externally applied potential is greater than the potential of the cell, the reaction goes in the opposite direction and the cell behaves like an electrolytic cell.

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