In the electrolytic refining process of Zinc, it is given that the crude metal is made anode while the electrolyte is used is H2SO4 (dilute) + ZnSO4 . The cathode should be:
All of the above
For the given electrolyte, Pure Zinc cathode gets dissolved in dilute H2SO4 and thus is impractical. Hence Aluminum is used as the cathode.