plumiOxidation, reduction, oxidising and reducing agents: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 8.A.2 Oxidation, reduction, oxidising and reducing agents, 2019–2025, with mark schemes and examiner’s reports where available.
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All 28 questions on Oxidation, reduction, oxidising and reducing agents, as a list
- June 2025, AS Unit 2, Q6 (1 mark): The most common sources of iodine contain the iodate ion IO3 – . Iodate ions react with iodide ions in acidic conditions as shown. 5I– + IO3 – + 6H+ → 3I2 + 3H2
- June 2025, AS Unit 2, Q15(c)(i) (1 mark): The equation for the reaction of concentrated sulfuric acid with potassium chloride is shown. H2SO4 + KCl → HCl + KHSO4 State why this is not a redox reaction.
- June 2025, AS Unit 3, Q4(a) (2 marks): Chlorine is generated by the vigorous redox reaction between concentrated hydrochloric acid and potassium manganate(VII). The chlorine moves through the apparat
- October 2024, AS Unit 2, Q20(c)(ii) (2 marks): Describe, with reference to oxidation numbers, what happens to Co when the cell is in use. (2)
- October 2024, AS Unit 2, Q20(c)(iii) (1 mark): Suggest one property the separator must have to ensure the lithium battery is viable. (1)
- June 2024, AS Unit 1, Q8 (1 mark): Which is the strongest oxidising agent in these displacement reactions? Cl2 + 2Br– → Br2 + 2Cl– Br2 + 2I– → 2Br– + I2 A chlorine B bromide ions C bromine D iodi
- June 2024 (R), AS Unit 2, Q19(b) (3 marks): Ozone can be used in the treatment of drinking water. As well as killing bacteria and viruses, ozone also removes other dissolved impurities such as hydrogen su
- January 2024, AS Unit 2, Q7 (1 mark): Which reaction involves the oxidation of a Group 7 element? A Br2 + F2 → 2BrF B U + 3ClF3 → UF6 + 3ClF C 2F2 + 2H2O → 4HF + O2 D KCl + H2SO4 → HCl + KHSO4 Use t
- January 2024, AS Unit 2, Q21(b)(i) (2 marks): Explain, in terms of oxidation numbers, why this is a redox reaction. (2)
- October 2023, AS Unit 2, Q19(b) (2 marks): Chlorine gas may be prepared by heating concentrated hydrochloric acid with solid manganese(IV) oxide. MnO2(s) + 4HCl(aq) → MnCl2(aq) + Cl2(g) + 2H2O(l) Show, b
- June 2023, Unit 5, Q21(b)(i) (2 marks): Explain, using oxidation numbers, why this is a redox reaction. (2)
- January 2023, Unit 5, Q20(b)(i) (2 marks): Chlorine can be prepared in a laboratory by reacting manganese(IV) oxide with concentrated hydrochloric acid. MnO2 + 4HCl → MnCl2 + Cl2 + 2H2O Explain, in terms
- October 2022, AS Unit 1, Q1 (1 mark): Which mixture results in a displacement reaction? A iron and copper(II) sulfate solution B lead(II) nitrate solution and sodium iodide solution C dilute hydroch
- October 2022, AS Unit 2, Q23(a)(ii) (2 marks): Explain why Step 2 is a redox reaction. Refer to relevant oxidation numbers in your answer. (2)
- October 2022, Unit 5, Q1 (1 mark): When copper is added to concentrated nitric acid, a brown gas is given off and the final solution is blue. In terms of oxidation number and electron transfer, h
- June 2022, AS Unit 2, Q2 (1 mark): How does an oxidising agent change during a redox reaction? Electrons Oxidation number A gains electrons decreases B gains electrons increases C loses electrons
- June 2022, AS Unit 2, Q5(b) (1 mark): Which element is oxidised and which is reduced when calcium reacts with water? (1) Element oxidised Element reduced A calcium hydrogen B calcium oxygen C hydrog
- January 2022, AS Unit 2, Q13 (1 mark): In which reaction is the copper species acting as an oxidising agent? A Cu2+ + 2Ag → 2Ag+ + Cu B 2Cu+ + O2– → Cu2O C 3Cu + O2 → Cu2O + CuO D Cu + Hg2+ → Hg + Cu
- October 2021, AS Unit 2, Q10(b) (1 mark): What is the reducing agent in the reaction? (1) A H+ B C2O4 2– C MnO4 – D SO4 2–
- October 2021, AS Unit 2, Q12 (1 mark): Which reaction is not a redox reaction? A 4KClO3(s) ® 3KClO4(s) + KCl(s) B 2HCl(aq) + Ba(OH)2(aq) ® BaCl2(aq) + 2H2O(l) C Zn(s) + CuSO4(aq) ® ZnSO4(aq) + Cu(s)
- October 2021, AS Unit 2, Q21(a)(ii) (2 marks): This is a redox reaction. State which element is oxidised and which is reduced. Justify your answer by giving the initial and final oxidation numbers of any ele
- January 2021, AS Unit 2, Q8 (1 mark): Magnesium reacts with hydrochloric acid. Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) Which statement about this reaction is correct? A magnesium atoms act as oxidising
- January 2021, Unit 6, Q2(d) (1 mark): Give the colour change observed in Step 1. (1)
- October 2020, AS Unit 1, Q2(a) (1 mark): Which of these is the best name for this type of reaction? (1) A addition B displacement C neutralisation D substitution
- October 2020, AS Unit 2, Q15(a) (2 marks): Silver ions have anti‑microbial properties and are used in some wound dressings. Silver nitrate can be made by warming a mixture of silver metal and concentrate
- October 2020, Unit 5, Q15 (1 mark): Which is a redox reaction? A Cr2O7 2− + 2C → Cr2O3 + CO3 2− + CO B CrO2Cl2 + 4OH− → CrO4 2− + 2Cl− + 2H2O C Cr2O7 2− + 2HCl → 2CrO3Cl− + H2O D 2CrO4 2− + 2H+ →
- January 2020, AS Unit 2, Q6(a) (1 mark): Which statement is correct? (1) A iodide ions oxidise chlorine B iodide ions reduce chlorine C chlorine reduces iodide ions D chlorine is neither oxidised nor r
- January 2020, AS Unit 2, Q18(d)(i) (1 mark): State why Reaction 1 is not a redox reaction. (1)
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