Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to?

• A. Achieve very high purity of aluminium (99.9%)
• B. Keep the electrolyte in liquid condition by the generation of heat
• C. Electrolytically dissociate alumina
• D. Both(b) & (c)