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Qualitative analysis: OCR A‑Level Chemistry A questions

Every OCR A-Level Chemistry A exam question on 3.1.4 Qualitative analysis, 2016–2025, with its mark scheme and examiner’s report.

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1,820 questions

  1. Q4(a)(ii)

    June 2025 · Paper 3

    7 marks5.2.3 Redox and electrode potentials3.1.4 Qualitative analysis
    The whole paper ↗
    June 2025 Paper 3, question 4(a)(ii): Complete the flowchart by adding formulae in the boxes. white precipitate white precipitate Ag+(aq) Ba2+(aq) acidic solution containing three ions Cl2(aq)/H2O(I

  2. Q22(c)

    June 2025 · AS Paper 1

    4 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2025 AS Paper 1, question 22(c): A group of students is provided with aqueous solutions of sodium chloride, sodium bromide and sodium iodide in three unlabelled bottles. Explain how the student

  3. Q10

    June 2024 · AS Paper 1

    1 mark3.1.4 Qualitative analysis
    The whole paper ↗
    June 2024 AS Paper 1, question 10: An unknown compound is tested to identify whether it contains sulfate, carbonate or halide ions. What is the correct sequence of tests required? A carbonate, ha

  4. Q1(c)(iii)

    June 2024 · AS Paper 2

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2024 AS Paper 2, question 1(c)(iii): Outline how you would test for the presence of NH4 Your answer should include observations. [2]

  5. Q11

    June 2023 · Paper 1

    1 mark3.1.4 Qualitative analysis
    The whole paper ↗
    June 2023 Paper 1, question 11: A student adds aqueous potassium carbonate to one test tube and aqueous silver nitrate to a second test tube. The student adds dilute hydrochloric acid to each

  6. Q4(c)(iii)

    June 2023 · Paper 3

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2023 Paper 3, question 4(c)(iii): How could the student carry out a test-tube test to confirm the anion in the Tutton’s salt? [2]

  7. Q2(b)(iii)

    June 2023 · AS Paper 2

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2023 AS Paper 2, question 2(b)(iii): The student changes the method in 2(b). In step 2, the student adds an excess of silver nitrate solution, AgNO3(aq), instead of Na2SO4(aq). Explain whether this

  8. Q1

    June 2022 · Paper 1

    1 mark3.1.4 Qualitative analysis
    The whole paper ↗
    June 2022 Paper 1, question 1: An aqueous solution contains a mixture of chloride, bromide and iodide ions. AgNO3(aq) is added to this mixture, followed by an excess of dilute NH3(aq). The re

  9. Q24(b)

    June 2022 · AS Paper 1

    5 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2022 AS Paper 1, question 24(b): A student is supplied with aqueous solutions of ionic compounds B and C. Compound B is a chloride, bromide or iodide of a Group 1 element. Compound C is a chlor

  10. Q2(b)(ii)

    June 2022 · AS Paper 2

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2022 AS Paper 2, question 2(b)(ii): A student adds a few drops of dilute sulfuric acid to the colourless solution. Describe what the student would observe, and give the formula of the barium compo

  11. Q1(c)

    November 2020 · AS Paper 2

    6 marks3.1.4 Qualitative analysis
    The whole paper ↗
    November 2020 AS Paper 2, question 1(c): This question is about nickel and its compounds. (c)* A student is provided with samples of three nickel compounds. One sample is nickel(II) bromide, another is

  12. Q23(b)

    June 2019 · AS Paper 1

    5 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2019 AS Paper 1, question 23(b): You are supplied with a sample of ammonium bromide. Describe simple tests that would identify the cation and anion present in ammonium bromide. Include reagents

  13. Q7

    June 2018 · Paper 1

    1 mark3.1.4 Qualitative analysis
    The whole paper ↗
    June 2018 Paper 1, question 7: Which statement about ammonium carbonate is not correct? A It reacts with Ba(NO3)2(aq) to form a white precipitate. B It effervesces with dilute nitric acid. C

  14. Q23(a)(ii)

    June 2018 · AS Paper 1

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2018 AS Paper 1, question 23(a)(ii): At the end of the experiment, the student adds a few drops of aqueous sodium chloride to the reaction mixture in the polystyrene cup to test whether all the aqu

  15. Q22(b)

    June 2017 · AS Paper 1

    5 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2017 AS Paper 1, question 22(b): B and C are ionic compounds of two different Group 1 elements. The molar masses of B and C are both approximately 140 g mol–1. A student dissolves B and C in wa

  16. Q1(b)(ii)

    June 2017 · AS Paper 2

    2 marks3.1.4 Qualitative analysis
    The whole paper ↗
    June 2017 AS Paper 2, question 1(b)(ii): Describe the use of aqueous barium chloride in qualitative analysis. [2]

  17. Q11

    June 2016 · AS Paper 1

    1 mark3.1.4 Qualitative analysis
    The whole paper ↗
    June 2016 AS Paper 1, question 11: A student adds aqueous sodium carbonate to one test-tube and aqueous silver nitrate to a second test-tube. The student adds dilute sulfuric acid to each test-tu
All 17 questions on Qualitative analysis, as a list
  1. June 2025, Paper 3, Q4(a)(ii) (7 marks): Complete the flowchart by adding formulae in the boxes. white precipitate white precipitate Ag+(aq) Ba2+(aq) acidic solution containing three ions Cl2(aq)/H2O(I
  2. June 2025, AS Paper 1, Q22(c) (4 marks): A group of students is provided with aqueous solutions of sodium chloride, sodium bromide and sodium iodide in three unlabelled bottles. Explain how the student
  3. June 2024, AS Paper 1, Q10 (1 mark): An unknown compound is tested to identify whether it contains sulfate, carbonate or halide ions. What is the correct sequence of tests required? A carbonate, ha
  4. June 2024, AS Paper 2, Q1(c)(iii) (2 marks): Outline how you would test for the presence of NH4 Your answer should include observations. [2]
  5. June 2023, Paper 1, Q11 (1 mark): A student adds aqueous potassium carbonate to one test tube and aqueous silver nitrate to a second test tube. The student adds dilute hydrochloric acid to each
  6. June 2023, Paper 3, Q4(c)(iii) (2 marks): How could the student carry out a test-tube test to confirm the anion in the Tutton’s salt? [2]
  7. June 2023, AS Paper 2, Q2(b)(iii) (2 marks): The student changes the method in 2(b). In step 2, the student adds an excess of silver nitrate solution, AgNO3(aq), instead of Na2SO4(aq). Explain whether this
  8. June 2022, Paper 1, Q1 (1 mark): An aqueous solution contains a mixture of chloride, bromide and iodide ions. AgNO3(aq) is added to this mixture, followed by an excess of dilute NH3(aq). The re
  9. June 2022, AS Paper 1, Q24(b) (5 marks): A student is supplied with aqueous solutions of ionic compounds B and C. Compound B is a chloride, bromide or iodide of a Group 1 element. Compound C is a chlor
  10. June 2022, AS Paper 2, Q2(b)(ii) (2 marks): A student adds a few drops of dilute sulfuric acid to the colourless solution. Describe what the student would observe, and give the formula of the barium compo
  11. November 2020, AS Paper 2, Q1(c) (6 marks): This question is about nickel and its compounds. (c)* A student is provided with samples of three nickel compounds. One sample is nickel(II) bromide, another is
  12. June 2019, AS Paper 1, Q23(b) (5 marks): You are supplied with a sample of ammonium bromide. Describe simple tests that would identify the cation and anion present in ammonium bromide. Include reagents
  13. June 2018, Paper 1, Q7 (1 mark): Which statement about ammonium carbonate is not correct? A It reacts with Ba(NO3)2(aq) to form a white precipitate. B It effervesces with dilute nitric acid. C
  14. June 2018, AS Paper 1, Q23(a)(ii) (2 marks): At the end of the experiment, the student adds a few drops of aqueous sodium chloride to the reaction mixture in the polystyrene cup to test whether all the aqu
  15. June 2017, AS Paper 1, Q22(b) (5 marks): B and C are ionic compounds of two different Group 1 elements. The molar masses of B and C are both approximately 140 g mol–1. A student dissolves B and C in wa
  16. June 2017, AS Paper 2, Q1(b)(ii) (2 marks): Describe the use of aqueous barium chloride in qualitative analysis. [2]
  17. June 2016, AS Paper 1, Q11 (1 mark): A student adds aqueous sodium carbonate to one test-tube and aqueous silver nitrate to a second test-tube. The student adds dilute sulfuric acid to each test-tu

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