O-LevelChemistryElectrolysis5070/11 · Oct/Nov 2016 · Q221 Mark

The diagram shows the apparatus used to extract aluminium from aluminium oxide. Which statement about this process is correct?

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AThe electrolyte is a solid mixture of aluminium oxide and cryolite.

BThe electrolyte is aluminium oxide dissolved in water.

CThe equation for the reaction at the positive electrode is Al³⁺ + 3e⁻ → Al.

DThe positive carbon electrodes lose mass during the process and need regular replacement.

✓ Correct answer

D: The positive carbon electrodes lose mass during the process and need regular replacement.

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 1, question 22.

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