O-LevelChemistryBonding & Structure5070/11 · Oct/Nov 2025 · Q381 Mark

A chromatogram of mixture X and pure substances P, Q, R and S is shown. Which statement is correct?

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AR is completely insoluble in the solvent used.

BThe Rf value of Q is greater than the Rf value of S.

CX is a mixture of Q, R and S.

DThe paper is placed in the solvent with the solvent above the baseline.

✓ Correct answer

B: The Rf value of Q is greater than the Rf value of S.

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2025 Paper 1 Variant 1, question 38.

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