O-LevelChemistryElectrolysis5070/12 · Oct/Nov 2021 · Q151 Mark

The apparatus shown is set up to plate a steel key with copper. The key does not get coated with copper. Which change needs to be made to plate the key?

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AIncrease the concentration of the aqueous copper(II) sulfate.

BIncrease the voltage.

CReplace the solution with dilute sulfuric acid.

DReverse the electrical connections.

✓ Correct answer

D: Reverse the electrical connections.

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 15.

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