Hoope's cell is predominantly used for the electrolytic refining of

ANS:C - aluminium

Hoope's cell is predominantly used for the electrolytic refining of zinc. In this process, impure zinc is dissolved as the anode in a solution of zinc sulfate, and pure zinc is deposited on a cathode made of aluminum. The electrolyte used is typically a solution of zinc sulfate. This electrolytic process helps to remove impurities from the zinc, resulting in high-purity zinc metal.