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1. 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): both(b) & (c).
(C): electrolytically dissociate alumina.
(D): keep the electrolyte in liquid condition by the generation of heat.
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