O-LevelChemistryChemistry of the Environment5070/11 · May/June 2020 · Q51 Mark

Which statement about methods of purification and analysis is correct?

Aliquid that boils over a range of temperatures may still be 100% pure.

BAn insoluble substance may be separated from water by crystallisation.

CChromatography may only be used to separate coloured substances.

DLiquid air can be fractionally distilled, giving oxygen as one of the products.

✓ Correct answer

D: Liquid air can be fractionally distilled, giving oxygen as one of the products.

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Topic: Chemistry of the Environment, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 1, question 5.

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