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In Hall's process, the main reagent is m...

In Hall's process, the main reagent is mixed with

A

`NaF`

B

`Na_(2)AlF_(6)`

C

`AlF_(3)`

D

none of these

Text Solution

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The correct Answer is:
B
Pure alumina is a bad conductor of electricity and the fussion temperature of pure alumina is about `2000^(@)C` and at this temperture when the electrolysis is carried of fused mass the metal formed vapourises as the boiling point of `Al` is `1800^(@)C`. To overcome this difficulty, `Na_(2)AlF_(6)` and `CaF_(2)` are mixed with alumina.
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