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In the extraction of aluminium by Hall-H...

In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to

A

lower the melting point of `Al_2 O_3`.

B

increase the conductivity of molten mixture.

C

reduce `Al^(3+)` into Al(s).

D

acts as catalyst.

Text Solution

Verified by Experts

The correct Answer is:
A, B
`CaF_2` mixed with purified `Al_2 O_3` helps in lowering the melting point of `Al_2 O_3` and increases the conductivity of the molten mixture.
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