Which statement about thin layer chromatography (TLC) is correct?
The stationary phase is a thin layer of a solid, such as silica, on a flat plate.
The mobile phase is a thin layer of a solid that moves slowly up the plate.
The solvent moves down the plate from a start line drawn near the top.
No solvent is needed, because the solid on the plate absorbs the spots.
51 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.