plumiTransition metal catalysts: Edexcel International A Level Chemistry questions
Every Edexcel International A Level Chemistry exam question on Transition metal catalysts (specification points 17.26–17.33), 2019–2025, with its mark scheme and examiner’s report.
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Calculations
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Q4(a)
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Q3(a)(iv)
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Q3(b)(i)
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Q19(b)(i)
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Q20(d)
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Q19(d)
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All 34 questions on Transition metal catalysts, as a list
- June 2025 (A), Unit 5, Q9 (1 mark): 2– , is mixed with 9 An acidified solution, containing tartrate ions, C4H4O6 hydrogen peroxide solution. When pink cobalt(II) chloride solution is added to the
- January 2025, Unit 5, Q5 (1 mark): Which statement about a catalytic converter used to reduce toxic emissions from internal combustion engines is not true? A the catalyst contains platinum B CO a
- October 2024, Unit 5, Q4(a) (1 mark): What is the best explanation for the high activation energy of this reaction? (1) A the peroxodisulfate ion is a weak oxidising agent B the iodide ion is a weak
- October 2024, Unit 5, Q4(b) (1 mark): Which property of iron(II) ions enables them to function as a catalyst for this reaction? (1) A iron(II) ions can be easily reduced to metallic iron B iron(II)
- October 2024, Unit 5, Q12 (1 mark): Car exhaust gases react on the surface of a catalytic converter. 2CO + 2NO → 2CO2 + N2 Which interactions could not occur between the gases and the catalytic co
- October 2024, Unit 5, Q13 (1 mark): Which pair of equations shows the most likely mechanism for vanadium(V) oxide acting as a catalyst in the contact process? A V2O5 + ½O2 → V2O6 then V2O6 + SO2 →
- October 2024, Unit 5, Q14 (1 mark): The formation of carbon dioxide from the reaction between manganate(VII) ions and ethanedioate ions is autocatalysed by manganese(II) ions. The equation for thi
- October 2024, Unit 6, Q3(a)(iv) (3 marks): Suggest why, in Step 2, the temperature of the mixture at the start should be 60°C but no further warming is needed after a small quantity of the potassium mang
- June 2024, Unit 5, Q2 (1 mark): An oxide of vanadium is the catalyst in one step of the contact process for the manufacture of sulfuric acid. Which reaction involves the vanadium oxide catalys
- June 2024, Unit 6, Q3(b)(i) (3 marks): Plot a graph of volume of sodium thiosulfate against time. (3)
- June 2024, Unit 6, Q3(b)(ii) (1 mark): Describe how the rate of reaction changes during the reaction. (1)
- June 2024, Unit 6, Q3(b)(iii) (3 marks): Explain why the rate of reaction changes in this way. (3)
- October 2023, Unit 5, Q6 (1 mark): Acidified manganate(VII) ions react with ethanedioate ions. 2− → 2Mn2+ + 8H2O + 10CO2 2MnO4 − + 16H+ + 5C2O4 The rate of this reaction increases then decreases.
- October 2023, Unit 5, Q19(b)(i) (1 mark): Give a reason why the activation energy for this reaction is high in the absence of a catalyst. (1)
- October 2023, Unit 5, Q19(b)(ii) (2 marks): Write the ionic equations for the reactions that occur when the catalyst of Fe2+ ions is added. State symbols are not required. (2)
- June 2023, Unit 5, Q14 (1 mark): What is the sequence of oxidation number changes for vanadium when V2O5 is used in the contact process? A +2 → +1 → +2 B +2 → +5 → +2 C +5 → +4 → +5 D +5 → +6 →
- January 2023, Unit 5, Q7 (1 mark): Persulfate ions react slowly with iodide ions at room temperature unless a catalyst of Fe2+ or Fe3+ is added to the reaction mixture. 2–(aq) + 2I–(aq) → 2SO4 2–
- January 2023, Unit 5, Q20(d) (3 marks): Manganate(VII) ions react with ethanedioate ions in acidic solution. 2MnO4 –(aq) + 16H+(aq) + 5C2O4 2–(aq) → 2Mn2+(aq) + 8H2O(l) + 10CO2(g) Two experiments were
- October 2022, Unit 5, Q9 (1 mark): The sequence shown is the mechanism for a reaction in aqueous solution. Step 1 Ag+ + Ce4+ → Ag2+ + Ce3+ Step 2 Ti+ + Ag2+ → Ti2+ + Ag+ Step 3 Ti2+ + Ce4+ → Ti3+
- October 2022, Unit 5, Q19(d) (2 marks): In the manufacture of sulfuric acid, vanadium(V) oxide, V2O5 , is the catalyst used in the conversion of sulfur dioxide to sulfur trioxide: 2SO2 + O2 2SO3 Wri
- June 2022, Unit 5, Q1(a) (1 mark): Some standard electrode potentials are shown. Right-hand electrode system E / V Cu2+ + e− Cu+ +0.15 I2 + 2e− 2I− +0.54 Fe3+ + e− Fe2+ +0.77 Cl2 + 2e− 2C
- June 2022, Unit 5, Q1(b) (1 mark): Which term best describes the type of catalyst for the reaction in (a)? (1) A autocatalyst B biocatalyst C heterogeneous D homogeneous
- June 2022, Unit 5, Q1(c) (1 mark): Which substance is manufactured in a process involving a reaction catalysed by vanadium(V) oxide? (1) A ammonia B nitric acid C sodium hydroxide D sulfuric acid
- October 2021, Unit 5, Q8 (1 mark): Which of the following is not true of the reactions occurring in the catalytic converter fitted to a car exhaust? A they involve heterogeneous catalysis B carbo
- October 2021, Unit 5, Q9 (1 mark): The reaction of ethanedioate ions, C2O 4 2– , with manganate(VII) ions, MnO 4 – , in acidic solution involves autocatalysis. 2– → 2Mn2+ + 10CO2 + 8H2O 2MnO 4 –
- October 2021, Unit 5, Q10 (1 mark): Iodide ions, I–, are oxidised by peroxodisulfate(VI) ions, S2O 8 2– . 2I–(aq) + S2O 8 2–(aq) → I2(aq) + 2SO 4 2–(aq) Which of the following statements is true o
- October 2021, Unit 5, Q20(a) (1 mark): Titanium(III) chloride is used as a catalyst in the production of poly(propene). State the property of transition metals, such as titanium, that makes their com
- June 2021, Unit 4, Q16(c) (3 marks): The presence of bromate(V) ions in drinking water is harmful to humans. Bromate(V) ions can be converted to less harmful bromide ions by passing the water throu
- June 2021, Unit 5, Q21(e)(i) (1 mark): State why the catalyst is described as ‘homogeneous’. (1)
- June 2021, Unit 5, Q21(e)(ii) (2 marks): Write two equations to show how iron(II) ions catalyse this oxidation. State symbols are not required. (2)
- June 2021, Unit 5, Q21(e)(iii) (1 mark): Suggest how iron(II) ions lower the activation energy of this reaction. (1)
- January 2021, Unit 5, Q9 (1 mark): Iodide ions are oxidised by peroxodisulfate ions in aqueous solution. 2I− + S2O2− → I2 + 2SO2− 8 4 This reaction is catalysed by adding Fe2+ ions to the solutio
- January 2021, Unit 5, Q23 (6 marks): Compare and contrast the mechanism of the action of platinum as a catalyst in the * removal of pollutants from car engine exhaust fumes with that of vanadium(V)
- October 2020, Unit 5, Q24(c) (6 marks): Transition metals, their compounds and their ions can act as heterogeneous and homogeneous catalysts. Compare and contrast these two types of catalytic behaviou
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