During electrolysis
(a) oxidation occurs at the cathode and reduction occurs at the anode
(b) oxidation occurs at both the electrodes
(c) reduction occurs at both the electrodes
(d) reduction occurs at the cathode and oxidation occurs at the anode.
d. Reduction occurs at the cathode and oxidation occurs at the anode.
Explanation: During electrolysis, reduction (gain of electrons) takes place at the cathode, while oxidation (loss of electrons) occurs at the anode.
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