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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?
  • a)
    Only reduction reactions occur in the cell
  • b)
    The electrochemical cell stops functioning
  • c)
    Only oxidation reactions occur in the cell
  • d)
    The electrochemical cell behaves like an electrolytic cell
Correct answer is option 'D'. Can you explain this answer?
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What is the observation when the opposing external applied potential t...
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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What is the observation when the opposing external applied potential t...
When the opposing external applied potential to an electrochemical cell is greater than the cell potential, the observation is that the cell will begin to operate in the reverse direction. This means that the flow of electrons and the direction of the chemical reactions within the cell will be reversed. The anode becomes the cathode and the cathode becomes the anode. For example, in a galvanic cell, where the spontaneous redox reaction occurs in the forward direction, the applied potential can push the reaction in the opposite direction, causing the cell to function as an electrolytic cell. In an electrolytic cell, the non-spontaneous reaction can be driven to occur by the applied potential.
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