O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2024 · Q391 Mark

A mixture of four coloured dyes is analysed by chromatography. The result is shown. [Chromatogram showing four coloured dyes, solvent front, baseline and three spots] Which change allows the four coloured dyes to be seen separately?

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AMeasure the Rf values of the spots carefully.

BRun the chromatogram for a longer time.

CRun the chromatogram using a different solvent.

DUse a locating agent.

✓ Correct answer

C: Run the chromatogram using a different solvent.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2024 Paper 1 Variant 1, question 39.

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