O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2014 · Q71 Mark

The experiment shown is used to test potassium bromide crystals. The lamp does not light. Distilled water is then added to the beaker and the lamp lights. Which statement explains these results?

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AElectrons are free to move in the solution when potassium bromide dissolves.

BMetal ions are free to move when potassium bromide melts.

CMetal ions are free to move when potassium reacts with water.

DOppositely charged ions are free to move in the solution when potassium bromide dissolves.

✓ Correct answer

D: Oppositely charged ions are free to move in the solution when potassium bromide dissolves.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2014 Paper 1 Variant 1, question 7.

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