Extraction of aluminium can be understood by :
Electrolytric reduction of `Al_(2) O_(3)` :
Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)`
Cathode : Carbon inside the `Fe` container
Anode : Graphite rods.
Coke power is spread over the molten electroltyte to.
A. Prevent the corrosion of graphite anode
B. Prevent the heat radiation form the surface
C. Prevent the oxidation of molten aluminium by air
D. Both (a) and (b)
