plumiPrecipitation with hydroxide and ammonia: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.3.1.5 Precipitation with hydroxide and ammonia, 2016–2025, with mark schemes and examiner’s reports where available.
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Q21(a)(ii)
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Open the full PDFYour answerQ23(a)(i)
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All 9 questions on Precipitation with hydroxide and ammonia, as a list
- June 2025, Paper 1, Q21(a)(ii) (2 marks): Solutions of iron(II) sulfate, FeSO4, and copper(II) sulfate, CuSO4, can be distinguished by adding aqueous sodium hydroxide. Describe what would be observed wh
- June 2024, Paper 1, Q22(b)(i) (3 marks): Suggest the formulae of A, B and C. Complex ion A: Solid B: Complex ion C: [3]
- June 2023, Paper 1, Q22(b)(i) (2 marks): Describe precipitation reactions using either copper or chromium ions as examples. Include equations. [2]
- June 2022, Paper 1, Q22(b)(i) (1 mark): Write an ionic equation for the formation of the pale green precipitate. [1]
- November 2020, Paper 1, Q22(a) (6 marks): (a)* B and C are compounds of two different transition elements. A student carries out test tube reactions on aqueous solutions of B and C. The observations of
- June 2019, Paper 1, Q18(a)(ii) (1 mark): Suggest an equation for the reaction in Experiment 2, Step 1. Include state symbols. [1]
- June 2019, Paper 3, Q6(a)(i) (2 marks): In the boxes, write the formulae of A and B. [2]
- June 2017, Paper 1, Q11 (1 mark): Aqueous Cr3+ ions are reacted with an excess of aqueous sodium hydroxide. Which product is formed? 3– A Cr(OH)6 B Cr(OH)3 [Cr(OH)4(H2O)2]– C [Cr(OH)4]3– D Your
- June 2017, Paper 1, Q23(a)(i) (5 marks): In the boxes, write down the formulae of the species responsible for the observations. yellow solution Reaction 1 HCl(aq) NH3(aq) [Cu(H2O)6]2+ pale blue solutio
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