plumiBidentate and hexadentate ligands, and haemoglobin: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.1.6 Bidentate and hexadentate ligands, and haemoglobin, 2019–2025, with mark schemes and examiner’s reports where available.
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Q15(d)(i)
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All 21 questions on Bidentate and hexadentate ligands, and haemoglobin, as a list
- June 2025, Unit 5, Q15(d)(i) (1 mark): DNA acts as a ligand in the formation of the complex shown in the diagram. Name this type of ligand. (1)
- 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
- January 2025, Unit 5, Q20(c)(ii) (2 marks): EDTA4– has been considered as a potential treatment for Cr3+ poisoning. O –O O –O N N O– O– O O EDTA4– Suggest how EDTA4– would act to treat Cr3+ poisoning, giv
- October 2024, Unit 5, Q18(d)(ii) (2 marks): Explain, by reference to the structure of ethane-1,2-diamine, why it is a bidentate ligand. (2)
- June 2024, Unit 5, Q16(b)(i) (3 marks): Complete the table for the complex. (3) Charge on nickel ion Type of ligand Co‑ordination number of the nickel ion Shape of metal complex around the nickel ion
- October 2023, Unit 5, Q3 (1 mark): What is the co-ordination number of chromium in the complex ion shown? + Cl H2N NH2 H2C CH2 Cr H2C CH2 H2N NH2 Cl A 2 B 3 C 4 D 6
- October 2023, Unit 5, Q19(d) (2 marks): Haemoglobin is an iron(II) complex which carries oxygen around the body. Part of the structure of oxyhaemoglobin is shown. O2 N N Fe2+ N N globin The four nitro
- June 2023, Unit 5, Q8 (1 mark): Which complex contains only monodentate ligands? A [Fe(CN)6]4– B [Cr(C2O4)3]3– C [Ni(EDTA)]2– D [Co(NH2CH2CH2NH2)2Cl2]
- January 2023, Unit 5, Q2(a) (1 mark): What is the coordination number of chromium(III) in this complex ion? (1) A 2 B 3 C 4 D 6
- 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, Q8 (1 mark): When oxygen binds to the haem group in haemoglobin, each oxygen molecule A bonds reversibly to an iron(II) ion B bonds irreversibly to an iron(II) ion C replace
- October 2022, Unit 5, Q23(e)(i) (2 marks): Draw a diagram of the complex that one salen ligand forms with a Ni2+ ion, showing the type of bonding involved. (2)
- June 2022, Unit 5, Q15(c)(i) (3 marks): The structure of DPC is shown. O H H N N N N H H Describe how DPC is able to act as a bidentate ligand, using your diagram to show the atoms involved. (3)
- January 2022, Unit 5, Q1(c) (1 mark): Which complex contains a bidentate ligand? (1) A [Co(NH2CH2CH2NHCH2CH2NH2)2]3+ B [Cu(NH3)4(H2O)2]2+ C [Ni(NH2CH2CH2NH2)3]2+ D [Mn(EDTA)]2− Use this space for ro
- October 2021, Unit 5, Q5 (1 mark): Which of the following statements best explains carbon monoxide poisoning? A carbon monoxide binds irreversibly to haemoglobin B carbon monoxide forms stronger
- October 2021, Unit 5, Q21(c) (2 marks): Curcumin anions can act as bidentate ligands in metal‑curcumin (M‑curc) complexes. The oxygen atoms of the curc ligand occupy adjacent coordination sites in the
- June 2021, Unit 5, Q6 (1 mark): Copper(II) ions form a complex with 1,2-diaminoethane (symbol ‘en’) with the formula Cu(en)3 2+. What type of ligand is 1,2-diaminoethane, and what is the coord
- June 2021, Unit 5, Q21(d)(ii) (2 marks): Suggest what type of ligand thioglycolic acid is in the iron(III) thioglycolic acid complex. Justify your answer. (2)
- 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, Q18 (1 mark): What is the coordination number of the nickel(II) ion and the overall charge, m, of this complex? m Cl O O C O O C Ni C O O C O O Cl Coordination number of Over
- October 2020, Unit 5, Q24(a)(iii) (2 marks): Complete the diagram to show the structure of the complex ion formed in Reaction 3, showing all of the atoms. (2) Fe
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