O-LevelChemistryElectrolysis5070/12 · Oct/Nov 2018 · Q131 Mark

Four processes using electrolysis are listed. 1 the electrolysis of concentrated aqueous sodium chloride 2 the electrolysis of dilute sulfuric acid 3 the extraction of aluminium from pure aluminium oxide 4 the purification of copper using aqueous copper(II) sulfate Which processes produce oxygen at one of the electrodes?

A1 and 2

B2 and 3

C2 and 4

D3 and 4

✓ Correct answer

B: 2 and 3

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 13.

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