Part 1 of 3

Can one colour hide several substances?

Explain

Try it yourself

Explain: give reasons and connect them to evidence.

Choose a valid starting position for the paper and sample spots. Explain how the other position could lose sample into the beaker.

Choose one answer1.Baseline and sample spots above the liquid; bottom edge in solvent2.Baseline and sample spots under the liquid

Explain what would happen to a submerged sample.

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Scope and sources

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

0620 Extended12.3.1–4: suitable solvent, coloured and colourless paper chromatography, known/unknown comparison, purity evidence and Rf. Bounded12.4.2 method choice. Illustrative data; no real practical or chemical identity certification.

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

Official Cambridge syllabus