O-LevelChemistryElectrolysis5070/12 · Oct/Nov 2019 · Q291 Mark

Aluminium is extracted from aluminium oxide by electrolysis. Which statement about this electrolysis is correct?

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AAluminium ions gain electrons to form aluminium.

BCryolite increases the melting point of the electrolyte.

CCryolite reacts with impurities to form slag.

DThe carbon cathode has to be replaced regularly as it reacts with oxygen.

✓ Correct answer

A: Aluminium ions gain electrons to form aluminium.

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 2, question 29.

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