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Commercially, aluminium is obtained from...

Commercially, aluminium is obtained from purified aluminium oxide by

A

electrolysis of aqueous `Al_2(SO_4)_3`

B

electrolysis of aqueous `KAI (SO_4)_2`

C

electrolysis of a fused mixture of `Al_2O_3` and `Na_3 AlF_6`

D

reduction with coke at high temperatures

Text Solution

Verified by Experts

The correct Answer is:
C
Aluminium is abtained by electrolytic reduction of purified alumina mixed with cryolite `(Na_3 AlF_6)` fluorspar `(CaF_2)` in an iron tank with carbon lining. The process is called Hall-Heroult prcess.
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