A) \[NaF\]
B) \[N{{a}_{3}}Al{{F}_{6}}\]
C) \[Al{{F}_{3}}\]
D) \[NaAl{{F}_{3}}\]
E) None of these
Correct Answer: B
Solution :
In Halls process, the main reagent alumina is mixed with molten cryolite\[(N{{a}_{3}}Al{{F}_{6}}).\] Molten cryolite decreases the melting point and increases the electrical conductivity.
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