plumiLigand exchange and the stability of complexes: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.2.4 Ligand exchange and the stability of complexes, 2019–2025, with mark schemes and examiner’s reports where available.
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Q15(c)
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All 29 questions on Ligand exchange and the stability of complexes, as a list
- June 2025, Unit 5, Q15(c) (2 marks): In human cells, the two chloride ions are replaced by water molecules in a ligand exchange reaction as shown. 2+ + 2Cl − PtCl2(NH3)2 + 2H2O [Pt(NH3)2(H2O)2 ]
- June 2025, Unit 5, Q15(d)(ii) (2 marks): Explain, by considering the equation shown, why this process is thermodynamically feasible. Pt(Cl)2(NH3)2 + DNA → [Pt(NH3)2(DNA)] 2+ + 2Cl − (2)
- June 2025, Unit 5, Q19 (6 marks): *19 A solution containing tetrachlorocuprate(II) ions, [CuCl4] 2−, is treated with dilute aqueous ammonia. The ammonia solution is added gradually. The followin
- June 2025 (A), Unit 5, Q8 (1 mark): When EDTA4– is added to an aqueous solution of iron(III) ions, the EDTA complex is formed. Which is the best explanation for this? A iron(III) ions form stronge
- October 2024, Unit 5, Q18(d)(i) (1 mark): Give a reason, by referring to the equation, why the formation of the diamine complex from the aqueous complex ion is thermodynamically favoured. (1)
- June 2024, Unit 5, Q16(b)(ii) (2 marks): Explain, using a balanced equation, why the formation of the dimethyldithiocarbamate complex from an aqueous solution of nickel ions is thermodynamically feasib
- January 2024, Unit 5, Q17(b)(i) (1 mark): Write the balanced equation for Step 1. State symbo
- October 2023, Unit 5, Q19(e) (2 marks): Ethanedioate ligands react with iron(II) ions in aqueous solution. 2− → [Fe(C2O4)2 (H2O)2]2− + 4H2O [Fe(H2O)6]2+ + 2C2O4 Explain, in terms of entropy, why this
- June 2023, Unit 5, Q12 (1 mark): Aqueous ammonia is added in excess to an aqueous solution of Cu2+. What is the equation for the overall reaction? A [Cu(H2O)6]2+ + 2NH3 → [Cu(H2O)4(OH)2] + 2NH4
- January 2023, Unit 5, Q6 (1 mark): The diagram shows how the relative colour intensity of an aqueous solution containing 0.001 mol of chromium(III) ions varies with increasing amounts of cyanide
- October 2022, Unit 5, Q22(b)(i) (1 mark): Name the type of reaction that occurs when concentrated hydrochloric acid is added to aqueous cobalt(II) sulfate. (1)
- October 2022, Unit 5, Q22(b)(ii) (2 marks): Write an ionic equation for the reaction that occurs when concentrated hydrochloric acid is added to aqueous cobalt(II) sulfate. State symbols are not required.
- October 2022, Unit 5, Q23(e)(ii) (2 marks): Explain why the salen ligand complex of the Ni2+ ion is much more stable than the aqua complex of the same ion. (2)
- October 2022, Unit 6, Q1(a)(iii) (1 mark): Add concentrated The formula of the complex ion formed is [CoCl4]2– hydrochloric acid
- June 2022, Unit 5, Q15(d) (2 marks): The concentration of nickel(II) ions, Ni2+(aq), can be determined by forming a complex with the ligand dimethylglyoxime, C4H8N2O2 . [Ni(H2O)6]2+ + 2C4H8N2O2 + 2
- January 2022, Unit 5, Q14 (6 marks): *14 Describe the reactions of separate samples of aqueous cobalt(II) sulfate with aqueous sodium hydroxide, excess aqueous ammonia and concentrated hydrochloric
- October 2021, Unit 5, Q7 (1 mark): Some nickel(II) complex ions are formed by the addition of complexing agents to nickel(II) ions, [Ni(H2O)6]2+ , in aqueous solution. On formation, which of thes
- October 2021, Unit 5, Q18(f) (2 marks): Complete the table, using as appropriate, to identify the type of each reaction. (2) Neutralisation Ligand exchange Redox Reaction 2 Reaction 3
- October 2021, Unit 6, Q1(a)(ii) (2 marks): Test 2 A few drops of concentrated hydrochloric acid were added to another sample of the copper(II) sulfate solution. More of the concentrated hydrochloric acid
- June 2021, Unit 5, Q8 (1 mark): When aqueous ammonia is added to an aqueous solution of zinc sulfate, a white precipitate forms which dissolves in excess ammonia to give a colourless solution.
- June 2021, Unit 6, Q1(b)(i) (2 marks): Suggest the formulae of two complex ions present in solution T. (2)
- June 2021, Unit 6, Q1(b)(ii) (1 mark): State how the colour of solution T would change on the addition of excess concentrated hydrochloric acid. (1)
- June 2021, Unit 6, Q2(b) (1 mark): Give the colour of the solution at the end of Step 2. (1)
- January 2021, Unit 5, Q8 (1 mark): Cobalt chloride is used as a test for the presence of water. This test depends on the fact that A anhydrous cobalt(II) chloride is blue and hydrated cobalt(II)
- January 2021, Unit 5, Q19(a) (7 marks): Identify, by name (including the oxidation state) or formula, the species in the sequence that contain copper. (7) P Q R S T V W
- January 2021, Unit 6, Q1(b)(i) (1 mark): B is a blue solution. When A is added to B, the mixture first turns green and then gradually turns yellow. Give the formula of the cation in B. (1)
- January 2021, Unit 6, Q1(b)(vii) (2 marks): A solution of the sodium salt of EDTA, Na4EDTA, is added to a sample of solution F. The solution turns pale blue. Write an equation for the reaction. State symb
- October 2020, Unit 5, Q24(a)(ii) (1 mark): State the type of reaction occurring in Reaction 2. (1)
- October 2020, Unit 6, Q1(a)(iii) (1 mark): Excess concentrated hydrochloric acid was added to a further portion of B and the mixture warmed. The precipitate dissolved to form a different yellow solution
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