A) \[~A1{{F}_{3}}\]
B) \[N{{a}_{3}}Al{{F}_{6}}\]
C) \[NaF\]
D) None of these
Correct Answer: B
Solution :
During Hall's process along with molten \[A{{l}_{2}}{{O}_{3}}\]small amount of cryolite \[(N{{a}_{3}}Al{{F}_{6}})\] and fluorspar \[(Ca{{F}_{2}})\]are also added as they decrease the melting point of and increase its electrical conductivity. Hence, the correct option is (b).
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