Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

sodium chloride

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fluorite

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cryolite

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calcium carbonate

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Solution

The correct options are
B fluorite
C cryolite
Cryolite is added to concentrated alumina so that the fusion temperature is lowered. Also, cryolite - $N a_{3} A l F_{6}$ - improves the conductivity of the melt.
Fluorspar - $C a F_{2}$ (also called fluorite) is added to improve the conductivity.

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Which of the following are added to concentrated alumina during the electrolytic reduction of alumina to aluminium by Hall-Heroult process?

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