O-LevelChemistryElectrolysis5070/11 · May/June 2017 · Q151 Mark

Aluminium is obtained by the electrolysis of molten aluminium oxide. Which row shows the electrode at which aluminium is formed and the correct equation for its formation?

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Aanode, Al3+ + 3e– → Al

Banode, Al3+ – 3e– → Al

Ccathode, Al3+ + 3e– → Al

Dcathode, Al3+ – 3e– → Al

✓ Correct answer

C: cathode, Al3+ + 3e– → Al

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2017 Paper 1 Variant 1, question 15.

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