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.
The purpose of adding cryolite is.
A. To increase eletrical consutivity
B. To lower the melting point `Al_(2)O_(3)`
C. To remove the impurities as slag
D. Both (a) & (B)
