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JEE Main2026Jan 21, Shift 2Chemistry
Q.

For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature ?

  1. A
  2. B
  3. C
  4. D
Solution

The quantity plotted on the y-axis is — the standard cell potential, which is a thermodynamic constant defined for unit activities at the given temperature. It does not vary with time as the cell discharges. So the correct plot is a flat horizontal line.

(Note: the operational cell voltage would decrease with time as concentrations shift away from standard, but the question asks about .)

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