Why does a substance that is strongly attracted to the paper have a low Rf R_f\,Rf value?
It dissolves less easily in the solvent, so it stays as a solid
It has a larger relative formula mass, so it travels more slowly
It is carried up the paper by the solvent, but at a lower speed
It spends more of the time in the stationary phase than in the mobile phase
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.