In the Hoope’s process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because –

Options

A. There is special arrangement in the cell to keep the layers separate
B. The three layers have different dinsities
C. The three layers are maintained at different temperatures.
D. The upper layer is kept attracted by the cathode and the lower layer is kept attracted by the anode.

Answer

B