plumiRedox reactions and metals with acids: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 2.1.5.2 Redox reactions and metals with acids, 2016–2025, with mark schemes and examiner’s reports where available.
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All 19 questions on Redox reactions and metals with acids, as a list
- June 2025, AS Paper 1, Q7 (1 mark): Which of the following is not a redox reaction? A CH4(g) + 2O2(g) CO2(g) + 2H2O(l) B NaOH(aq) + HCl (aq) NaCl (aq) + H2O(l) C 2KCl O3(s) 2KCl (s) + 3O2(g) D Fe(
- June 2024, Paper 3, Q4(b)(ii) (3 marks): Aqueous silver nitrate, AgNO3, is reduced by PH3. The unbalanced equation is shown below. Balance the equation and use oxidation numbers to explain why this is
- June 2024, AS Paper 2, Q2(b)(i) (2 marks): Explain, in terms of electron transfer, why the reaction shown in equation 2.1 is a redox reaction. [2]
- June 2023, Paper 1, Q20(d)(i) (1 mark): Construct an ionic equation for the reaction of magnesium with an acid. [1]
- June 2022, Paper 1, Q21(a)(ii) (2 marks): Write half-equations for the reaction of magnesium with hydrochloric acid. Oxidation half-equation: Reduction half-equation: [2]
- November 2020, Paper 1, Q18(a) (3 marks): A student adds magnesium metal to an aqueous solution of ethanoic acid, CH3COOH. A redox reaction takes place. Write the overall equation for this reaction and
- November 2020, Paper 3, Q4(a)(ii) (2 marks): In Stage 1, suggest two observations that would confirm that all of metal M has reacted. 1 2 [2]
- November 2020, AS Paper 1, Q6 (1 mark): The equation for a redox reaction is shown below. 2HCl O3 + 2HCl → 2Cl O2 + Cl 2 + 2H2O Which statement is correct? A Cl is both oxidised and reduced. B Cl is o
- November 2020, AS Paper 2, Q1(a) (1 mark): Nickel reacts with dilute hydrochloric acid in a redox reaction. Ni(s) + 2HCl (aq) NiCl 2(aq) + H2(g) Explain, in terms of the number of electrons transferred,
- June 2019, Paper 1, Q6 (1 mark): Which reaction is a redox reaction? A NaCl + AgNO3 AgCl + NaNO3 B NaNO2 + HCl NaCl + HNO2 C CaSO3 + 2HCl CaCl 2 + H2O + SO2 D 3CuO + 2NH3 3Cu + 3H2O + N2 Your a
- June 2019, Paper 3, Q6(a)(ii) (1 mark): The student thinks that the reaction of iron(II) sulfide with H+ / H2O is a redox reaction. Explain, with reasons, whether the student is correct. [1]
- June 2019, AS Paper 1, Q9 (1 mark): Which reaction shows chlorine only being oxidised? A Cl 2 + H2O → HCl + HCl O B 2Cl O2 + 2NaOH → NaCl O2 + NaCl O3 + H2O C 4KCl O3 → 3KCl O4 + KCl D MnO2 + 4HCl
- June 2019, AS Paper 2, Q2(c) (2 marks): Magnesium nitrate decomposes when heated, as shown in the equation. 2Mg(NO3)2(s) 2MgO(s) + 4NO2(g) + O2(g) Using oxidation numbers, show which element has been
- June 2018, AS Paper 1, Q7 (1 mark): Which reaction shows oxidation of sulfur? A 2HBr + H2SO4 → SO2 + 2H2O + Br2 B SO2 + 2NaOH → Na2SO3 + H2O C 8HI + H2SO4 → 4I2 + H2S + 4H2O D H2S + Cl 2 → 2HCl +
- June 2018, AS Paper 1, Q22(a)(i) (1 mark): In terms of the number of electrons transferred, explain whether magnesium is being oxidised or reduced. [1]
- June 2017, Paper 3, Q2(d)(ii) (2 marks): Using oxidation numbers, with signs, show the element that is oxidised and the element that is reduced in this reaction. Element oxidised Oxidation number chang
- June 2017, Paper 3, Q2(d)(iii) (1 mark): Construct the equation for this reaction. Equation [1]
- June 2017, AS Paper 1, Q24(b)(ii) (2 marks): This reaction is a redox reaction. Deduce which element has been oxidised and which element has been reduced, and state the changes in oxidation number. Element
- June 2016, AS Paper 1, Q22(d) (2 marks): Salts can also be prepared in redox reactions of metals with acids. A student prepares a solution of aluminium sulfate by reacting aluminium with dilute sulfuri
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