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The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased by_________________?

The emf of a Deniell cell “Zn | Zn2+ || Cu2+ | Cu” can be increased 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