Chemistry · Oct / Nov 2021 · Paper 11 · Question 4

A mixture of four coloured dyes is analysed by chromatography. The result is shown. [chromatogram diagram] Which change will allow the four dyes to be seen?

1. AMeasure the Rf values of the spots carefully.
2. BRun the chromatogram for a longer time.
3. CRun the chromatogram using a different solvent.
4. DUse a locating agent.

As printed in the paper