Pigments were extracted from flower petals. The petal extract and pure reference pigments P and Q were run on the same chromatography paper using the same solvent. The petal extract produced spots with Rf R_f\,Rf values of 0.36 and 0.72. Pigment P produced a spot with an Rf R_f\,Rf value of 0.72, and pigment Q produced a spot with an Rf R_f\,Rf value of 0.51.
Which conclusion is correct?
The results support pigment P, but not pigment Q, as a possible component of the extract.
The results support both pigment P and pigment Q as possible components of the extract.
The results support pigment Q, but not pigment P, as a possible component of the extract.
The results do not support either pigment P or pigment Q as a possible component of the extract.
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.