plumiThin-layer and gas chromatography: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 6.3.1.1 Thin-layer and gas chromatography, 2016–2025, with mark schemes and examiner’s reports where available.
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Q22(a)(i)
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Open the full PDFYour answerQ17(b)(i)
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All 9 questions on Thin-layer and gas chromatography, as a list
- June 2025, Paper 2, Q22(a)(i) (1 mark): Determine the Rf values of the two α-amino acids in the chromatogram. [1]
- June 2024, Paper 2, Q13 (1 mark): A sample containing a mixture of 3 components, X, Y and Z, is analysed using gas chromatography. The gas chromatogram below is obtained. The relative peak areas
- June 2024, Paper 3, Q5(a)(i) (1 mark): Determine the Rf value of propan-1-ol. Show your working. Rf = [1]
- June 2024, Paper 3, Q5(a)(iii) (3 marks): A student investigates the alkaline hydrolysis of 1-chloropropane using the same method as for 1-bromopropane. Predict, with reasons, how the appearance of the
- November 2021, Paper 2, Q10 (1 mark): A TLC chromatogram for two compounds is shown below. solvent front origin What is the Rf value for the compound that is most strongly adsorbed onto the stationa
- November 2020, Paper 2, Q13 (1 mark): Which statement(s) is/are correct for gas chromatography? 1 The components in a mixture can be identified from their retention time. 2 The relative peak areas g
- June 2019, Paper 2, Q17(b)(i) (1 mark): What is the Rf value of serine (ser) in solvent W? Rf = [1]
- June 2019, Paper 2, Q17(b)(ii) (2 marks): Analyse the chromatograms to identify the unknown amino acid. Explain your reasoning. Name of unknown amino acid Explanation [2]
- June 2018, Paper 2, Q21(c)(i) (2 marks): The concentration of ester K in the cosmetic product is 9.13 × 10−2 g dm−3. Using the results, calculate the concentration, in mol dm−3, of ester M in the cosme
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