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Extraction of aluminium can be understoo...

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)

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The correct Answer is:
D
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