A) alumina
B) bauxite
C) molten cryolite
D) alumina mixed with molten cryolite
Correct Answer: D
Solution :
Aluminium is extracted by electrolysis of a fused mixture of alumina (2-8%) synthetic cryolite \[N{{a}_{3}}Al{{F}_{6}}\] (80-85%), \[Al{{F}_{3}}\] and fluorspar. This makes alumina good conductor and lowers the fusion temperature also.
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