An ink and a pure dye Y were each run on chromatography paper, but a different solvent was used for each one. The ink gave a spot with an Rf R_f\,Rf value of 0.44 and dye Y gave a spot with an Rf R_f\,Rf value of 0.44.
Which conclusion is correct?
The ink contains dye Y, because the two RfR_fRf values are equal
The ink contains dye Y, because both spots moved the same distance
The ink does not contain dye Y, because a pure dye gives one spot
No conclusion can be drawn, because different solvents were used
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.