O-LevelChemistryElectrolysis5070/11 · Oct/Nov 2011 · Q141 Mark

Which statement about the electrolysis of an aqueous solution of copper(II) sulfate with platinum electrodes is correct?

AOxygen is given off at the positive electrode.

BThe mass of the negative electrode remains constant.

CThe mass of the positive electrode decreases.

DThere is no change in the colour of the solution.

✓ Correct answer

A: Oxygen is given off at the positive electrode.

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2011 Paper 1 Variant 1, question 14.

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