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Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:

1. Al2O3 + HF + NaAlF4
2. Al2O3 + CaF2 + NaAlF4
3. Al2O3 + Na3AlF6 + CaF2
4. Al2O3 + KF + Na3AlF6

Correct answer: Al2O3 + Na3AlF6 + CaF2

Solution

Aluminium is extracted by the Hall-Héroult process, where alumina is dissolved in a molten mixture of cryolite (Na3AlF6) and calcium fluoride (CaF2) to lower the melting point and improve conductivity.

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