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In the Hall–Héroult process, aluminium is obtained by electrolysing which material?

1. bauxite
2. alumina
3. alumina dissolved in molten cryolite
4. molten cryolite

Correct answer: alumina dissolved in molten cryolite

Solution

The Hall–Héroult process specifically involves the electrolysis of alumina that is dissolved in molten cryolite, as this mixture lowers the melting point and improves the efficiency of the electrolysis process.

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