Question
OCR Paper C1 (Foundation) — PAG C5
A spot of dye moves 3.0 cm up a chromatography paper while the solvent moves 12.0 cm.
(a) Calculate the Rf value of the dye. (2 marks) (b) Why is the baseline drawn in pencil rather than ink? (1 mark)
3 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.