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Chemistry · May / June 2021 · Paper 12 · Question 3

5070Separation and purification

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

  1. Acopper sulfate crystals and water — crystallisation
  2. Bethanol and water — evaporation
  3. Csalt and sand — filtration
  4. Dnitrogen and oxygen — fractional distillation

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Correct answer: D. nitrogen and oxygen — fractional distillation

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