The sketch illustrates refining of aluminium by Hoope's process. [reference]

(i) Which of A and B is the cathode and which one is the anode?

(ii) What is the electrolyte in the tank?

(iii) What material is used for the cathode?

(i) A is cathode and B is anode.

(ii) Mixture of cryolite, BaF₂, AlF, CaF₂ serves as the electrolyte

(iii) Pure molten aluminium with carbon electrodes serves as the cathode.