How can an electrochemical cell be converted into an electrolytic cell?
Electrochemistry · Class 12 · JEE Main Previous Year Question
How can an electrochemical cell be converted into an electrolytic cell?
- a
Applying an external opposite potential lower than .
- b
Reversing the flow of ions in salt bridge.
- c✓
Applying an external opposite potential greater than .
- d
Exchanging the electrodes at anode and cathode.
Applying an external opposite potential greater than .
Strategy: Distinguish between a galvanic cell (converts chemical energy to electrical) and an electrolytic cell (uses electrical energy to drive a non-spontaneous chemical change).
Analysis: A galvanic (electrochemical) cell has a spontaneous reaction producing a potential . To reverse the natural flow and drive the non-spontaneous reaction:
- Apply an external potential () in the opposite direction.
- If , the cell is for\ced to run in reverse.
- In this state, it functions as an electrolytic cell.
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