Chromatography
20 past-paper questions on Chromatography · examined 2020–2025.
20251 question
Four samples are analysed using paper chromatography. P, Q and R are pure substances. M is a mixture of different substances.
20241 question
A mixture of four coloured dyes is analysed by chromatography. The result is shown. Which change allows the four coloured dyes to be seen separately?
20235 questions
The results of a paper chromatography experiment are shown. X is an aqueous solution of a salt of a Group I element. Y is an aqueous solution of a salt of a transition element. Which row is correct?
Name apparatus X.
State why it is important to have a lid on X.
State why the start line is: • above the level of the solvent • drawn in pencil.
The Rf value of one of the dyes in the food colouring is 0.60. In the separation this dye travels 5.7 cm. Calculate the distance travelled by the solvent during the separation.
20211 question
A mixture of four coloured dyes is analysed by chromatography. The result is shown. Which change will allow the four dyes to be seen?
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