A) NaF
B) \[N{{a}_{3}}Al{{F}_{6}}\]
C) \[Al{{F}_{3}}\]
D) None of these
Correct Answer: B
Solution :
Pure alumina is a bad conductor of electricity and the fusion temperature of pure alumina is about \[{{2000}^{o}}C\]. At this temperature, when the electrolysis is carried of fused mass, the metal formed vaporises as the boiling point of Al is \[{{1800}^{o}}C\]. To overcome this difficulty, \[N{{a}_{3}}Al{{F}_{6}}\] and \[Ca{{F}_{2}}\] are mixed with alumina.
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