Electrolytic reduction of `Al_(2)O_(3)`.
Electrolyte (`Al_(2)O_(3)+"cryolite")`
Anode: Graphite rods.
The purpose of adding crylite is :
A. to increase electrical conductivity
B. to lower the melting point of `Al_(2)O_(3)`
C. To remove the impurities as slag.
D. to increase melting point of `Al_(2)O_(3)`