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___________________?
Correct answer: B. Both B. & C.
- 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
Explanation
In the Hall-Héroult cell, electric current electrolytically decomposes dissolved alumina and the electrical resistance of the molten bath supplies the heat needed to keep the electrolyte liquid. Consequently, both B and C are correct.
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