plumiRedox: CAIE IGCSE Chemistry questions
Every CAIE IGCSE Chemistry exam question on 6.4 Redox, June 2024 and the specimen papers, with its mark scheme and examiner’s report.
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Calculations
Q5(e)
The whole paper ↗
Q4(d)
The whole paper ↗![June 2024 Paper 4, question 4(d): Deduce the oxidation number of iodine, I, in: HI I2. [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062041-jun24-04-d-qp.webp)
Q3(f)
The whole paper ↗![Specimen Paper 3, question 3(f): When the oxide Co3O4 is heated in hydrogen, cobalt metal is formed. Co3O4 + 4H2 → 3Co + 4H2O Explain how this equation shows that Co3O4 is reduced. [1] [Total:](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/062003-spec-03-f-qp.webp)
Q3(b)(i)
The whole paper ↗
All 9 questions on Redox, as a list
- June 2024, Paper 1, Q17 (1 mark): Which equation represents an oxidation reaction? A CaCO3 → CaO + CO2 B 4FeO + O2 → 2Fe2O3 C 2NO2 → N2O4 D 2P2O5 → P4O10
- June 2024, Paper 2, Q22 (1 mark): The equation for the reaction of magnesium with carbon dioxide is shown. 2Mg + CO2 → 2MgO + C Which statement about this reaction is correct? A Magnesium is oxi
- June 2024, Paper 2, Q23 (1 mark): Chlorine displaces bromine from aqueous potassium bromide. The ionic equation for the reaction is shown. Cl 2 + 2Br– → 2Cl – + Br2 Which statement about this re
- June 2024, Paper 3, Q5(e) (1 mark): Chromium can be produced by heating chromium(III) oxide, Cr2O3, with carbon. Cr2O3 + 3C → 2Cr + 3CO Describe how this equation shows that chromium(III) oxide
- June 2024, Paper 4, Q4(d) (2 marks): Deduce the oxidation number of iodine, I, in: HI I2. [2]
- Specimen, Paper 1, Q15 (1 mark): Which equation shows an oxidation reaction? A C + O2 → CO2 B CaCO3 → CaO + CO2 C CaO + 2HCl → CaCl 2 + H2O D N2O4 → 2NO2
- Specimen, Paper 2, Q17 (1 mark): When chlorine gas dissolves in water a reaction occurs. Cl 2 + H2O → HCl + HClO Which row of the table identifies the oxidation number for chlorine in the chlor
- Specimen, Paper 3, Q3(f) (1 mark): When the oxide Co3O4 is heated in hydrogen, cobalt metal is formed. Co3O4 + 4H2 → 3Co + 4H2O Explain how this equation shows that Co3O4 is reduced. [1] [Total:
- Specimen, Paper 4, Q3(b)(i) (3 marks): Identify the changes in oxidation numbers of copper and oxygen in this reaction. Explain in terms of changes in oxidation numbers why this is a redox reaction.
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