O-LevelChemistryStoichiometry5070/11 · May/June 2012 · Q21 Mark

A mixture of two substances is spotted onto a piece of chromatography paper. The paper is inserted into a beaker containing a liquid. For separation of the substances to occur the spot of mixture must

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Abe placed so that the spot is just below the level of the liquid.

Bbe soluble in the liquid.

Ccontain substances of the same Rf values.

Dcontain substances that are coloured.

✓ Correct answer

B: be soluble in the liquid.

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2012 Paper 1 Variant 1, question 2.

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