The emf of a Deniell cell "Zn | Zn2+ || Cu2+ | Cu" can be increased by_________________?
Correct answer: D. Increasing the concentration of copper sulphate solution
- A. Decreasing the surface area of the electrodes
- B. Increasing the concentration of zinc sulphate solution
- C. Increasing the surface area of the electrodes
- D. Increasing the concentration of copper sulphate solution
Explanation
The cell potential increases when the Cu²⁺ concentration increases, as given by the Nernst equation, while increasing Zn²⁺ concentration lowers it. Electrode surface area affects the rate or current capacity, not the equilibrium emf.
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