plumiOxidation states of vanadium: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.2.1 Oxidation states of vanadium, 2019–2025, with mark schemes and examiner’s reports where available.
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All 20 questions on Oxidation states of vanadium, as a list
- June 2025, Unit 5, Q5 (1 mark): 2+ ions? 5 What is the colour of an aqueous solution of V A blue B green C purple D yellow Use this space for any rough working. Anything you write in this spac
- January 2025, Unit 5, Q4 (1 mark): What is the colour of the VO2+ ion in aqueous solution? A blue B green C violet D yellow
- June 2024, Unit 5, Q1 (1 mark): What colour is vanadium(III) in aqueous solution? A blue B green C purple D yellow
- January 2024, Unit 6, Q3(a)(i) (1 mark): Suggest why only an approximate volume of sulfuric acid was used. (1)
- January 2024, Unit 6, Q3(a)(ii) (1 mark): The cotton wool helps to prevent the reoxidation of the vanadium and to allow the escape of hydrogen gas. State why hydrogen gas was produced. You may include a
- January 2024, Unit 6, Q3(a)(iv) (3 marks): The student concluded that zinc had reduced the vanadium(V) to the vanadium(II) oxidation state. Explain the sequence of colours that the student would have see
- January 2023, Unit 5, Q18(a) (1 mark): State the oxidation number of vanadium in Na3VO4 . (1)
- January 2023, Unit 5, Q18(b) (3 marks): In aqueous solution, vanadium(II) exists as [V(H2O)6]2+ but vanadium(V) exists as [VO2(H2O)4]+. Explain why vanadium(V) does not exist as [V(H2O)6]5+. (3)
- January 2023, Unit 5, Q18(e) (6 marks): Vanadium(V) ions, VO2 oxidation states. Compare and contrast the use of iron and tin in this reduction process. Include equations and Ecell values for any react
- October 2022, Unit 5, Q19(b)(i) (4 marks): Justify the use of sodium thiosulfate for this reaction by writing the relevant equations and calculating their Ecell values. Use the standard electrode potenti
- October 2022, Unit 5, Q19(b)(ii) (2 marks): Explain why nickel, Ni, is not a suitable reagent to convert VO2+ into V3+, with no other vanadium species being formed. (2)
- October 2022, Unit 5, Q19(c)(ii) (2 marks): Suggest why the VO2+ ions formed do not affect the titration. (2)
- June 2022, Unit 5, Q3 (1 mark): Excess aqueous sodium thiosulfate is added to an aqueous solution of ammonium vanadate(V). What colour is the mixture when the reaction is complete? Refer to pa
- June 2021, Unit 6, Q1(a)(i) (1 mark): When excess dilute sulfuric acid is added to an aqueous solution of NH4VO3 , − ion is converted into the VO2 + ion. the VO3 Write the ionic equation for the con
- June 2021, Unit 6, Q1(a)(ii) (1 mark): State the colour of an acidified solution of ammonium vanadate(V). (1)
- June 2021, Unit 6, Q1(a)(iii) (2 marks): A student added zinc metal to an acidified solution of ammonium vanadate(V). The zinc reduced the vanadium in a series of reactions. The student suggested that
- June 2021, Unit 6, Q1(a)(iv) (2 marks): When the mixture obtained at the end of the sequence in (a)(iii) is filtered, the filtrate changes colour from violet to green on standing. No further changes
- October 2020, Unit 5, Q24(b)(i) (2 marks): Complete the table to show the colours of the ions that each of these oxidation states has in aqueous solution. (2) Colour of the ions in Oxidation state of van
- October 2020, Unit 5, Q24(b)(ii) (1 mark): Two vanadium species exist in equilibrium in an aqueous solution. −(aq) + H2O(l) ⇌ VO2 VO3 +(aq) + 2OH−(aq) Deduce whether or not this is a redox reaction. Just
- October 2020, Unit 5, Q24(b)(iii) (5 marks): Predict the oxidising agent that could convert vanadium(II) ions to vanadium(III) ions and then vanadium(IV) ions, but not to vanadium(V) ions, under standard c
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