O-LevelChemistryBonding & Structure5070/12 · Oct/Nov 2018 · Q21 Mark

Four substances are heated gently. The temperatures at which they start and finish melting are recorded. Which statement about the substances is correct?

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ASubstance 1 is the only pure substance.

BSubstance 3 and substance 4 are impure.

CSubstance 4 is water.

DThey are all solids at room temperature.

✓ Correct answer

B: Substance 3 and substance 4 are impure.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 2.

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