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In Hall - Heroult process, the following...

In Hall - Heroult process, the following is used for reducing `Al_2O_3`:-

A

Graphite

B

`CaF_2`

C

`Na_3AIF_6`

D

Magnesium

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Hall-Heroult's process is given by :

Hall-Heroult method is used during extraction of :-

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