O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2017 · Q61 Mark

Four samples are spotted onto chromatography paper. It is known that one of these samples is pure compound Q. A separate sample of pure compound Q is also spotted onto the paper. The paper is placed in a solvent. The diagram shows the chromatogram produced. Which statement is correct?

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ASample 2 has travelled the furthest and sample 3 is pure compound Q.

BSample 3 has travelled the furthest and sample 2 is pure compound Q.

CSample 4 has travelled the furthest and sample 1 is pure compound Q.

DSample 4 has travelled the furthest and sample 2 is pure compound Q.

✓ Correct answer

D: Sample 4 has travelled the furthest and sample 2 is pure compound Q.

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 6.

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