plumiTests for anions and the ammonium ion: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 3.1.4.1 Tests for anions and the ammonium ion, 2016–2025, with mark schemes and examiner’s reports where available.
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Q22(c)
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Open the full PDFYour answerQ23(a)(ii)
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All 14 questions on Tests for anions and the ammonium ion, as a list
- 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
- 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
- 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]
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- June 2017, Paper 1, Q8 (1 mark): Four pairs of solutions are mixed. Which pair of solutions forms a white precipitate? A NH4Cl (aq) and NaOH(aq) B KBr(aq) and AgNO3(aq) C FeCl 3(aq) and NH3(aq)
- 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
- June 2017, AS Paper 2, Q1(b)(ii) (2 marks): Describe the use of aqueous barium chloride in qualitative analysis. [2]
- 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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