In the $Hoop$ process for the refining of $Al$,the molten materials form three different layers and remain separate during electrolysis because ..........
- AThe upper layer is connected to the cathode and the lower layer is connected to the anode.
- BThere is a special arrangement in the cell to keep these layers separate.
- CThe three layers maintain different densities.
- DThese layers are maintained at different temperatures.
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