Bauxite mining is a major industry in Jamaica. During the extraction of aluminium from bauxite, molten aluminium oxide undergoes electrolysis. At the cathode, which process occurs?

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Question

Bauxite mining is a major industry in Jamaica. During the extraction of aluminium from bauxite, molten aluminium oxide undergoes electrolysis. At the cathode, which process occurs?

Accepted Answer

Aluminium ions are reduced to aluminium atoms — Award 1 mark for recognising that at the cathode (negative electrode), aluminium ions gain electrons and are reduced to aluminium metal. A is incorrect because gaining electrons is reduction, not oxidation. C describes the process at the anode, not the cathode. D is incorrect because oxide ions lose electrons (oxidation) at the anode.

Answer

Aluminium ions are reduced to aluminium atoms

Answer

Oxide ions are reduced to oxygen gas

Answer

Aluminium ions are oxidised to aluminium atoms

Answer

Oxide ions are oxidised to oxygen gas

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