Electrolytic reduction of alumina to aluminium by Hall-Heroult's process is carried out in the presence of:

N a C l

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fluorite

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N a O H

at high pressure

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cryolite

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Solution

The correct option is D cryolite
Cryolite is added to lower the melting point of alumina as well as to make it a better conductor of electricity.

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

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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