Multiple choice

Aluminium metal is extracted by the electrolysis of its _________.

  1. molten Chlorides

  2. molten Sulphide

  3. molten oxide

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminium is extracted from bauxite (Al2O3) by the Hall-Héroult process, which involves electrolysis of molten aluminium oxide dissolved in cryolite. Molten chlorides are not the source - bauxite is an oxide ore. The key is that alumina must be molten for electrolysis to work.

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