O-LevelChemistryElectrolysis5070/11 · May/June 2010 · Q121 Mark

The diagram shows the apparatus used to electrolyse lead(II) bromide using inert electrodes. Why does the lamp light up only when the lead(II) bromide is melted?

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ABromine atoms in the lead(II) bromide are converted to ions when it is melted.

BElectrons flow through the lead(II) bromide when it is melted.

CThe ions in lead(II) bromide are free to move only when the solid is melted.

DThere are no ions in solid lead(II) bromide.

✓ Correct answer

C: The ions in lead(II) bromide are free to move only when the solid is melted.

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2010 Paper 1 Variant 1, question 12.

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