plumiStereoisomerism in complexes and cis-platin: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 5.3.1.3 Stereoisomerism in complexes and cis-platin, 2016–2025, with mark schemes and examiner’s reports where available.
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Q21(c)
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Open the full PDFYour answerQ3(a)
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All 12 questions on Stereoisomerism in complexes and cis-platin, as a list
- June 2025, Paper 1, Q21(c) (2 marks): Aqueous copper(II) sulfate reacts with salicylic acid to form a complex ion which has two stereoisomers. One isomer of the complex ion is shown: 2– O O O Cu O O
- June 2025, Paper 3, Q4(b)(iii) (1 mark): Complete the 3D diagram below to show a stereoisomer of complex A. OH2 Ni OH2 [1]
- June 2024, Paper 3, Q3(a)(ii) (3 marks): A complex ion E contains three C2O4 Complex ion E exists as a mixture of two optical isomers. Draw 3D diagrams to show the structures of the optical isomers of
- June 2023, Paper 1, Q14 (1 mark): Which statement(s) is/are correct for the anti-cancer complex Pt(NH3)2Cl 2? 1 It has bond angles of 90º. 2 The oxidation number of Pt is +4. 3 It forms both opt
- June 2022, Paper 1, Q22(a)(ii) (4 marks): The iron(III) ion, Fe3+, forms a complex ion A with two ethane-1,2-diamine ligands and two chloride ligands. Complex ion A has cis and trans stereoisomers. One
- June 2022, Paper 3, Q1(d)(ii) (3 marks): Glycine reacts with aqueous copper(II) ethanoate to form copper(II) glycinate, Cu(H2NCH2COO)2, and ethanoic acid. Copper(II) glycinate is a complex which exists
- November 2021, Paper 1, Q17(b)(ii) (6 marks): This question is about d-block elements. (ii)* Determine the formulae of A and B. Write the ionic equation for the ligand substitution and show 3D structures fo
- November 2020, Paper 1, Q15 (1 mark): Which statement(s) for the complex ion [Co(NH2CH2CH2NH2)3]2+ is/are correct? 1 It has cis and trans isomers. 2 It has optical isomers. 3 It is six-fold coordina
- June 2019, Paper 1, Q13 (1 mark): What is the number of stereoisomers that Ni(H2NCH2CH2NH2)2Cl 2 can form? A 2 B 3 C 4 D 6 Your answer [1]
- June 2018, Paper 1, Q15 (1 mark): Which statement(s) is/are correct for the complex Pt(NH3)2Cl2? 1 One of its stereoisomers is used as an anti-cancer drug. 2 It has bond angles of 109.5°. 3 It h
- June 2018, Paper 3, Q3(a) (3 marks): The ethanedioate ion, shown below, can act as a bidentate ligand. O O –O O– Fe3+ forms a complex ion with three ethanedioate ions. The complex ion has two optic
- June 2017, Paper 1, Q23(b) (6 marks): This question is about reactions of ions and compounds of transition elements. (b)* A hydrated nickel(II) complex, A, is heated in a crucible to remove the wate
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