plumiHalogen reactivity and displacement reactions: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 3.1.3.2 Halogen reactivity and displacement reactions, 2016–2025, with mark schemes and examiner’s reports where available.
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Q16(c)
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Open the full PDFQ22(b)(i)
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Open the full PDFYour answerQ20(a)(ii)
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Open the full PDFYour answerQ3(a)(i)
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All 12 questions on Halogen reactivity and displacement reactions, as a list
- June 2025, Paper 1, Q16(c) (3 marks): A student adds an aqueous solution of bromine, Br2(aq), to two test tubes. The student adds aqueous sodium iodide, NaI(aq), to the Br2(aq) in one test tube, and
- June 2025, AS Paper 1, Q22(b)(i) (3 marks): Explain why chlorine reacts more vigorously than bromine. [3]
- June 2024, Paper 1, Q14 (1 mark): Chlorine has the electron configuration [Ne]3s23p5. Which statement(s) about chlorine is/are correct when it reacts in redox reactions? 1 It can gain one electr
- June 2024, Paper 1, Q20(a)(ii) (2 marks): Sea water contains aqueous bromide ions. Chlorine is used to extract bromine from sea water. Construct the ionic equation for this reaction and explain why chlo
- June 2023, Paper 3, Q1(g) (1 mark): The element that forms 1– ions most readily. [1]
- June 2023, AS Paper 2, Q3(a) (6 marks): This question is about halogens and halogen compounds. (a)* Seawater contains very small quantities of dissolved iodide ions. The concentration of potassium iod
- November 2021, AS Paper 1, Q23(d) (5 marks): A student investigates the trend in reactivity of the halogens Cl 2, Br2 and I2. The student is supplied with: • solutions of Cl 2, Br2 and I2 in cyclohexane (a
- November 2020, Paper 1, Q21(a) (5 marks): A student adds a solution of bromine in an organic solvent to two test tubes. The student adds aqueous sodium chloride to one test tube, and aqueous sodium iodi
- June 2019, Paper 1, Q2 (1 mark): Which statement about the reactions of halogens with halide ions is correct? I2(aq) can oxidise Br−(aq). A Cl 2(aq) can reduce Br−(aq). B Br−(aq) can reduce Cl
- June 2018, AS Paper 2, Q3(a)(i) (1 mark): Write an ionic equation for the reaction. [1]
- June 2018, AS Paper 2, Q3(a)(ii) (3 marks): Explain why iodine is less reactive than bromine. [3]
- June 2016, AS Paper 1, Q23(a)(ii) (2 marks): Write an ionic equation for this reaction and state why this reaction takes place in terms of reactivity of the halogens. [2]
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