plumiLigands and complex ion shapes: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.3.1.2 Ligands and complex ion shapes, 2016–2025, with mark schemes and examiner’s reports where available.
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Open the full PDFYour answerQ21(b)(i)
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Open the full PDFQ21(b)(ii)
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Open the full PDFQ3(a)(i)
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Open the full PDFQ22(a)(i)
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Open the full PDFQ17(b)(i)
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Open the full PDFQ18(a)(iii)
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Open the full PDFYour answerQ4(c)(i)
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All 13 questions on Ligands and complex ion shapes, as a list
- June 2025, Paper 1, Q15 (1 mark): Chromium forms the complex ions [Cr(NH3)6]3+ and [Cr(OH)6]3–. Which statement(s) about the complexes is / are correct? 1 Chromium is in the same oxidation state
- June 2025, Paper 1, Q21(b)(i) (1 mark): What is meant by a monodentate ligand? [1]
- June 2025, Paper 1, Q21(b)(ii) (4 marks): An iron(II) complex contains two different ligands: C5H5N, and Cl –. The complex has a molar mass of 442.8 g mol–1 and the following percentage composition by m
- June 2025, Paper 3, Q4(b)(ii) (3 marks): Complex A can be prepared by reacting an aqueous solution of nickel(II) sulfate with amino acid B and potassium hydroxide. Aqueous nickel(II) sulfate contains t
- June 2024, Paper 1, Q22(b)(ii) (2 marks): Cobalt (III) forms an octahedral complex ion D, which contains both ammonia and chloride ligands. Complex ion D has a molar mass of 197.9 g mol–1. Determine the
- June 2024, Paper 3, Q3(a)(i) (2 marks): Explain what is meant by the term bidentate ligand. [2]
- June 2023, Paper 1, Q22(c) (2 marks): The ethanedioate ion, C2O4 A complex ion of cobalt(III) contains two ethanedioate ligands and two water ligands. Determine the charge of this complex ion and th
- June 2022, Paper 1, Q22(a)(i) (1 mark): Explain why ethane-1,2-diamine can act as a bidentate ligand. [1]
- November 2021, Paper 1, Q17(b)(i) (1 mark): What is meant by a bidentate ligand? [1]
- November 2020, Paper 3, Q2 (6 marks): 2* Transition metal ions can bond to ligands to form complex ions with different shapes. Explain what is meant by the terms ligand, coordination number and liga
- June 2019, Paper 1, Q18(a)(iii) (2 marks): Draw a 3-D diagram for the shape of the complex ion that forms in Experiment 2, Step 2. Include the charge of the ion. [2]
- June 2017, Paper 1, Q2 (1 mark): What is the bonding between the ligands and the metal ion in [Fe(H2O)6]2+? 2 A Metallic B Ionic C Hydrogen D Dative covalent Your answer [1]
- June 2017, Paper 3, Q4(c)(i) (1 mark): Draw the structure of the ligand in chromium(III) picolinate. [1]
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