O-LevelChemistryElectrolysis5070/11 · May/June 2016 · Q151 Mark

Aqueous copper(II) sulfate is electrolysed using carbon electrodes. Which observations will be made?

Acolourless gas forms, blue colour fades, pink solid forms

Bcolourless gas forms, no change, colourless gas forms

Celectrode decreases in mass, blue colour fades, colourless gas forms

Delectrode decreases in mass, no change, pink solid forms

✓ Correct answer

A: colourless gas forms, blue colour fades, pink solid forms

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 1, question 15.

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