plumiLigands and complex ions: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.1.2 Ligands and complex ions, 2019–2025, with mark schemes and examiner’s reports where available.
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All 20 questions on Ligands and complex ions, as a list
- June 2025, Unit 5, Q6 (1 mark): Which is incorrect for H2O, OH − and NH3? A all can act as bidentate ligands B all can act as electron pair donors C all can form dative covalent bonds D all ca
- June 2025 (A), Unit 5, Q6 (1 mark): Excess aqueous silver nitrate is added to a solution containing 0.100 mol of chromium(III) chloride, CrCl3•6H2O. A precipitate, AgCl, appears immediately, which
- June 2025 (A), Unit 5, Q16(a)(ii) (2 marks): Describe the bonding between the manganese(II) ion and the ligands. (2)
- January 2025, Unit 5, Q1 (1 mark): Which species cannot act as a ligand in the formation of a complex ion? A C2H6 B CO C OH– D C4H9NH2
- January 2025, Unit 6, Q1(a)(ii) (1 mark): State the formula of the complex ion. (1)
- October 2024, Unit 5, Q18(b)(ii) (3 marks): 12.8 cm3 of 0.05 mol dm−3 iron(III) chloride solution reacted with 8.0 cm3 of 0.08 mol dm−3 ammonium thiocyanate to form a complex ion. Deduce the formula of th
- October 2024, Unit 5, Q18(d)(iii) (3 marks): Explain how the H N H bond angles would be expected to change in ethane-1,2-diamine when the complex ion is formed. (3)
- January 2024, Unit 5, Q17(a)(ii) (5 marks): You are provided with three equimolar solutions of the three isomers. Suggest how you would quantitatively determine the relative numbers of free chloride ions
- January 2024, Unit 5, Q17(b)(ii) (1 mark): Describe how guanine and adenine can bind to the platinum ion. (1)
- October 2023, Unit 5, Q19(c)(i) (2 marks): Explain how water acts as a monodentate ligand. (2)
- January 2023, Unit 5, Q2(b) (1 mark): What is the overall charge on this complex ion? (1) A 0 B +1 C +2 D +3 Use this space for any rough working. Anything you write in this space will gain no credi
- October 2022, Unit 6, Q1(a)(i) (1 mark): Note the A pink solution The formula of the complex (1) appearance ion formed is
- January 2022, Unit 5, Q1(a) (1 mark): The bonding within the complex [Cu(NH3)4(H2O)2]2+ is (1) A covalent, dative covalent and ionic B covalent and dative covalent only C covalent only D dative cova
- January 2022, Unit 6, Q1(a) (1 mark): Give the formula of a complex ion of chromium present in solution A. (1)
- October 2021, Unit 5, Q18(b) (1 mark): Give the formula of complex ion B. (1)
- October 2021, Unit 5, Q20(b)(i) (2 marks): THF acts as a monodentate ligand in complex Y. State the meaning of the terms monodentate and ligand. (2)
- June 2021, Unit 5, Q4 (1 mark): A ligand must be an A electron-pair donor B electron-pair donor and negatively charged C electron-pair acceptor D electron-pair acceptor and negatively charged
- January 2021, Unit 5, Q7(b) (1 mark): What is the bonding between the ligands and the central atom in these complexes? (1) A the bonding in both complexes is ionic B the bonding in both complexes is
- January 2021, Unit 5, Q19(b)(i) (1 mark): Name this type of chemical species. (1)
- October 2020, Unit 5, Q17 (1 mark): Which of the following species will not act as a ligand in the formation of a complex ion? A CH3NH2 B CN− C NH3 D NH4 +
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