plumiRedox reactions: Eduqas A‑Level Chemistry questions
Every Eduqas A-Level Chemistry exam question on PI1.2 Redox reactions, 2016–2025, with its mark scheme and examiner’s report.
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Q10(d)(ii)
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Q4(b)(i)
The whole paper ↗![June 2025 Component 3, question 4(b)(i): Give the ionic equation for the reaction of copper(II) ions with iodide ions. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun25-04-bi-qp.webp)
Q4(b)(ii)
The whole paper ↗![June 2025 Component 3, question 4(b)(ii): Show that the value of a, the number of copper(II) ions in each formula unit, is 3. [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun25-04-bii-qp.webp)
Q1(a)
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Q1(b)
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Q1(c)(i)
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Q1(c)(ii)
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Q5(a)
The whole paper ↗![Autumn 2021 Component 3, question 5(a): Write the ion / electron half-equation for the oxidation of iodide ions to form iodine. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-oct21-05-a-qp.webp)
Q5(b)
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Q5(c)
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Q5(d)(i)
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Q5(d)(ii)
The whole paper ↗![Autumn 2021 Component 3, question 5(d)(ii): Calculate the percentage by mass of lead(IV) oxide in the solid sample W. [2] Percentage by mass = %](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-oct21-05-dii-qp.webp)
Q5(e)
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Q4(b)(i)
The whole paper ↗![Autumn 2020 Component 1, question 4(b)(i): Suggest why the value from titration 1 is not used in calculating the mean titre. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-oct20-04-bi-qp.webp)
Q4(b)(ii)
The whole paper ↗![Autumn 2020 Component 1, question 4(b)(ii): Calculate the number of moles of iodine produced from each 25.0 cm3 of aqueous copper(II) sulfate solution. [1] Moles of iodine = ……… ………………… mol](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-oct20-04-bii-qp.webp)
Q8(a)
The whole paper ↗![June 2019 Component 1, question 8(a): Calculate the mean volume of acidified potassium manganate(VII) solution added. [1] Mean volume = cm3](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun19-08-a-qp.webp)
Q8(b)
The whole paper ↗![June 2019 Component 1, question 8(b): Calculate the number of moles of Fe2+ present in each 25.00 cm3 portion. [2] Number of moles = mol](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u10-jun19-08-b-qp.webp)
Q3(a)(i)
The whole paper ↗![June 2019 Component 3, question 3(a)(i): Give the ionic equation for the reaction of iron with dilute acid. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun19-03-ai-qp.webp)
Q3(b)
The whole paper ↗![June 2019 Component 3, question 3(b): Suggest why it was necessary to prevent any air from entering the flask. [1] Step 2 Titration of the iron(II) solution against a standard solution of potassium](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/a410u30-jun19-03-b-qp.webp)
Q3(c)(ii)
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All 26 questions on Redox reactions, as a list
- June 2025, Component 1, Q10(d)(ii) (4 marks): Tin(II) compounds in solution oxidise slowly to form tin(IV). The concentration of tin(II) ions remaining in solution can be found by titration against a soluti
- June 2025, Component 3, Q4(b)(i) (1 mark): Give the ionic equation for the reaction of copper(II) ions with iodide ions. [1]
- June 2025, Component 3, Q4(b)(ii) (3 marks): Show that the value of a, the number of copper(II) ions in each formula unit, is 3. [3]
- June 2024, Component 3, Q1(a) (1 mark): For step 3, give the colour change of the starch indicator at the end-
- June 2024, Component 3, Q1(b) (1 mark): Identify the titration that has the smallest percentage error in the m
- June 2024, Component 3, Q1(c)(i) (1 mark): of Ca(IO3)2.xH2O / g 0.481 0.493 0.474 Volume of S2O3 2–(aq) / cm3 21.45 22.00 21.15 (c) The five steps of the calculation are shown below. (i) Number these in
- June 2024, Component 3, Q1(c)(ii) (5 marks): Carry out the calculation to determine the relative formula mass of t
- Autumn 2021, Component 3, Q5(a) (1 mark): Write the ion / electron half-equation for the oxidation of iodide ions to form iodine. [1]
- Autumn 2021, Component 3, Q5(b) (1 mark): Use the equation for the overall reaction in step 1 to write the ion / electron half-equation for the r
- Autumn 2021, Component 3, Q5(c) (1 mark): Identify an appropriate indicator that could be used in step 3, and give the colour change at the end-p
- Autumn 2021, Component 3, Q5(d)(i) (1 mark): Calculate the number of moles of sodium thiosulfate used in the titration of 25.0 cm3 of solution X
- Autumn 2021, Component 3, Q5(d)(ii) (2 marks): Calculate the percentage by mass of lead(IV) oxide in the solid sample W. [2] Percentage by mass = %
- Autumn 2021, Component 3, Q5(e) (1 mark): The balance used in weighing the lead(IV) oxide has an uncertainty for each reading of ±0.005 g. Calcul
- Autumn 2020, Component 1, Q4(b)(i) (1 mark): Suggest why the value from titration 1 is not used in calculating the mean titre. [1]
- Autumn 2020, Component 1, Q4(b)(ii) (1 mark): Calculate the number of moles of iodine produced from each 25.0 cm3 of aqueous copper(II) sulfate solution. [1] Moles of iodine = ……… ………………… mol
- June 2019, Component 1, Q8(a) (1 mark): Calculate the mean volume of acidified potassium manganate(VII) solution added. [1] Mean volume = cm3
- June 2019, Component 1, Q8(b) (2 marks): Calculate the number of moles of Fe2+ present in each 25.00 cm3 portion. [2] Number of moles = mol
- June 2019, Component 3, Q3(a)(i) (1 mark): Give the ionic equation for the reaction of iron with dilute acid. [1]
- June 2019, Component 3, Q3(b) (1 mark): Suggest why it was necessary to prevent any air from entering the flask. [1] Step 2 Titration of the iron(II) solution against a standard solution of potassium
- June 2019, Component 3, Q3(c)(ii) (4 marks): The student pipetted 25.0 cm3 of the iron(II) solution into a conical flask. He added 25 cm3 of dilute sulfuric acid and titrated against the 0.0200 mol dm–3 po
- June 2019, Component 3, Q3(d)(i) (1 mark): Why did the student carry out several titrations and then calculate a mean volume of potassium dichromate(VI) used? [1]
- June 2019, Component 3, Q3(d)(ii) (1 mark): Write the equation for the reaction of iron(II) ions with dichromate(VI) ions in acid solution. [1]
- June 2019, Component 3, Q3(d)(iii) (3 marks): Calculate the percentage of iron in the wire. [3] Percentage = ……… %
- June 2019, Component 3, Q3(d)(iv) (1 mark): The balance used in weighing the wire has an uncertainty for each reading of ± 0.005 g. Estimate the maximum percentage error in weighing the wire. Show your wo
- June 2018, Component 1, Q13(a) (4 marks): Redox titration is one method to find the mass of copper in a known mass of alloy. A 2.877 g sample of alloy is dissolved in concentrated nitric acid. The mixtu
- June 2017, Component 3, Q4(b)(ii) (4 marks): Calculate the number of moles of bromine that did not react with the alkene and hence the number of moles of bromine that reacted. [4] n(Br2) that reacted = mol
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