625. The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

By /
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
✅ The correct answer is option D.

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