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8.1 Purity, formulations and chromatography

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Question 24
H

Ink X gave three spots and ink Y gave three spots with the same three Rf R_f\,Rf​ values, using the same paper and the same solvent.

Which conclusion is correct?

[1]
A

Inks X and Y are the same ink, because the two chromatograms are identical

B

Inks X and Y are pure substances, because each ink gave the same number of spots

C

Inks X and Y have no dyes in common, because two dyes cannot have equal RfR_fRf​ values

D

Inks X and Y may contain the same three dyes, but the amount of each dye could differ

Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

40 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.

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