0653.C6.3.03 — Identify redox reactions as reactions involving gain and loss of oxygen: past paper questions
Real questions on 0653.c6.3.03 — identify redox reactions as reactions involving gain and loss of oxygen
The newest 5 of 5 written questions. Open one to see it on the real paper.
- 0653/31 · October/November 2025 · Q6c(i)[1]
Name this type of reaction.
See it on the paper → - 0653/32 · February/March 2021 · Q8c(iii)[1]
Circle the word to show whether lead(II) oxide is oxidised or reduced in this reaction. Explain your answer. oxidised reduced explanation
See it on the paper → - 0653/11 · October/November 2019 · Q21[1]
In which reaction is a metal oxide being reduced?
See it on the paper → - 0653/33 · October/November 2019 · Q8b(ii)[1]
State the type of chemical change that happens when oxygen is removed from a substance.
See it on the paper → - 0653/42 · February/March 2019 · Q5c(iii)[2]
The word equation for one of the reactions occurring in the blast furnace is shown below. iron (III) oxide + carbon monoxide iron + carbon dioxide Explain why this is a redox reaction.
See it on the paper →
What examiners said
Candidates who were familiar with reduction being the removal of oxygen gained full credit. Some candidates circled reduced, but did not give any, or good enough explanations. Many candidates wrote oxidised so gained no credit.
— Examiner report, February/March 2021, 0653/32 Q8(c)(iii) (Cambridge)
Candidates were asked to recall the term ‘reduction’ having been given a description of reduction. Quite a few candidates left this blank and there were a very wide range of incorrect responses that suggested candidates did not understand the question. A few candidates incorrectly stated that the process was oxidation.
— Examiner report, October/November 2019, 0653/33 Q8(b)(ii) (Cambridge)
The majority of candidates were familiar with redox and many wrote perfect answers. The strongest candidates made it clear that it was iron(III) oxide that is reduced rather than iron. Similarly the strongest answers stated that it was carbon monoxide that is oxidised rather than carbon. Candidates should be advised that when answering questions like this one they should use the names of the subst...
— Examiner report, February/March 2019, 0653/42 Q5(c)(iii) (Cambridge)
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