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Cryolite cannot be used in the Hall-Heroult process of smelting aluminium.

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Cryolite cannot be used in the Hall-Heroult process of smelting aluminium.

(a) True

(b) False

This question was addressed to me in an online interview.

My question is taken from Chemical Processes of Aluminium in section Wrought Aluminium Alloys of Aerospace Materials & Processes

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The correct option is (b) False

The explanation is: The above statement is incorrect. Molten cryolite is used in the Hall-Heroult process of extraction of aluminium.  It is not a common mineral and is usually colourless or white. It is of brittle tenacity.

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