O-LevelChemistryBonding & Structure5070/12 · May/June 2021 · Q31 Mark

Which separation method would give pure samples of both substances from the mixture?

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Amixture: copper sulfate crystals and water, separation method: crystallisation

Bmixture: ethanol and water, separation method: evaporation

Cmixture: salt and sand, separation method: filtration

Dmixture: nitrogen and oxygen, separation method: fractional distillation

✓ Correct answer

D: mixture: nitrogen and oxygen, separation method: fractional distillation

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 3.

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