Oxides: past paper questions
Real questions on oxides
The newest 12 of 12 written questions. Open one to see it on the real paper.
- 0653/01 · Specimen 2025 · Q19[1]
Which row identifies the formulas of an acidic oxide and a basic oxide?
See it on the paper → - 0653/32 · October/November 2025 · Q6b(iv)[1]
The universal indicator turns purple during the reaction. Suggest the pH of the solution formed during the reaction. pH =
See it on the paper → - 0653/43 · October/November 2025 · Q5a(i)[1]
Halogens can be represented by the formula X 2 . State the term used to describe molecules with the formula X 2 .
See it on the paper → - 0653/43 · October/November 2025 · Q5a(ii)[2]
Complete Table 5.1: • • state the appearance of bromine at room temperature and pressure (r.t.p.) predict the appearance of astatine at r.t.p. (ii) Table 5.1 halogen appearance at r.t.p. chlorine pale yellow-green gas bromine iodine grey-black solid astatine
See it on the paper → - 0653/43 · October/November 2025 · Q5b[3]
Aqueous potassium iodide is colourless. Aqueous chlorine is added to aqueous potassium iodide in a test-tube. State the colour change observed. colour change explanation Explain why this colour change occurs.
See it on the paper → - 0653/43 · October/November 2025 · Q5c(i)[1]
State why chlorine is used in the treatment of the domestic water supply.
See it on the paper → - 0653/43 · October/November 2025 · Q5c(ii)[1]
State one other stage in the treatment of the domestic water supply.
See it on the paper → - 0653/31 · May/June 2025 · Q6a(vii)[1]
is an acidic oxide.
See it on the paper → - 0653/11 · October/November 2022 · Q19[1]
Which statement about this reaction is not correct?
See it on the paper → - 0653/11 · October/November 2022 · Q23[1]
Which statement is correct?
See it on the paper → - 0653/11 · October/November 2022 · Q25[1]
What is observed?
See it on the paper → - 0653/11 · October/November 2022 · Q27[1]
What are the products of the complete combustion of octane?
See it on the paper →
What examiners said
Candidates of all abilities found this question demanding. Oxides of non-metals, in this case carbon dioxide, form acidic solutions when dissolved in water.
— Examiner report, May/June 2025, 0653/31 Q6(a)(vii) (Cambridge)
Candidates chose the incorrect C and D more often than the correct answer, A. Candidates are reminded that the noble gases are monoatomic and unreactive because their outer shells are full of electrons.
— Examiner report, October/November 2022, 0653/11 Q23 (Cambridge)
There was evidence that many candidates guessed at the answer as all options were popular choices. Candidates should be able to describe chemical tests for water using copper(II) sulfate and cobalt(II) chloride, including colour changes.
— Examiner report, October/November 2022, 0653/11 Q25 (Cambridge)
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