Two dyes, L and M, are used to colour plastic. Each dye was analysed by paper chromatography in two different solvents.
| Dye | Number of spots in solvent 1 | Number of spots in solvent 2 |
|---|---|---|
| L | 1 | 1 |
| M | 1 | 2 |
Which conclusion about dyes L and M is correct?
The results support both dyes being mixtures because their solvent 2 patterns differ
The results support both dyes being pure because each gives one spot in solvent 1
The results do not support a purity conclusion because two solvents were used
The results support L being pure, while M contains at least two substances
113 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.