Part 2 of 3

What if both liquids can escape?

explain

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explain: give reasons and connect them to evidence.

Choose the statement that explains what a fractionating column does. Explain why it improves separation without acting as a filter.

Choose one answer1.The packing filters out B particles2.Repeated phase changes enrich the rising vapour3.Only A can vaporise below the pure boiling point of B

What happens on the packing?

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Scope and sources

Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.

0620 12.4.1(d/e): simple and fractional distillation; bounded12.4.2 method selection. Nonvolatile salt solution and a hypothetical miscible non-azeotropic A/B mixture. No petroleum fractions, complete purity testing or quantitative equilibrium.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus