In the extraction of aluminium by electrolysis, what substances are present in the molten mixture besides pure alumina? What are used as the cathode and anode in this electrolysis? [2+1]
WBBSE
Class X
Physical Science
Metallurgy
03 Mark
2026
Besides pure alumina (Al₂O₃), the molten mixture contains:
- Cryolite (Na₃AlF₆)
- Fluorspar (CaFâ‚‚)
In the electrolytic cell:
- Cathode: Carbon lining of the iron tank
- Anode: Graphite (carbon) rods
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