Following reactions may occur at cathode during the electrolysis of aqueous CuCl₂ solution using Pt electrodes:

On the basis of their standard electrode potential values, which reaction is feasible at cathode?

Cu²⁺(aq) + 2e^- → Cu (s)

Since the standard electrode potential of Cu²⁺ is greater than that of H⁺, so reaction (i) will be feasible at cathode.
i.e. Cu²⁺ + 2e^- → Cu
Cu²⁺ has higher reduction potential.