O-LevelChemistryElectrolysis5070/11 · May/June 2014 · Q211 Mark

Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode (positive electrode) is weighed at regular intervals. Which graph is obtained when the mass of the anode is plotted against time?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AGraph showing mass of anode decreasing linearly with time

BGraph showing mass of anode increasing linearly with time

CGraph showing mass of anode remaining constant with time

DGraph showing mass of anode decreasing linearly with time

✓ Correct answer

C: Graph showing mass of anode remaining constant with time

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2014 Paper 1 Variant 1, question 21.

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