O-LevelChemistryOrganic Chemistry5070/12 · Oct/Nov 2020 · Q31 Mark

Chromatography can be used to separate and identify dyes present in a mixture. Which statement is correct?

Adye with an Rf value of 1.2 can be present in a mixture.

Bdye could have a different Rf value if a different solvent was used.

CAll blue dyes have the same Rf value.

DChromatography can only be used for coloured substances such as dyes.

✓ Correct answer

B: dye could have a different Rf value if a different solvent was used.

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2020 Paper 1 Variant 2, question 3.

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