0654.C12.5.03 — Describe tests to identify the gases: (a). ammonia, NH3, using damp red litmus paper (b). carbon dioxide, CO2, using limewater (c). chlorine: past paper questions
Real questions on 0654.c12.5.03 — describe tests to identify the gases: (a). ammonia, nh3, using damp red litmus paper (b). carbon dioxide, co2, using limewater (c). chlorine
The newest 10 of 10 written questions. Open one to see it on the real paper.
- 0973/41 · May/June 2026 · Q7a[2]
Describe the test for carbon dioxide gas and give the observation for a positive result.
See it on the paper → - 0973/42 · May/June 2025 · Q6d[2]
Molecule Y reacts with sodium carbonate. Carbon dioxide is made in the reaction. State the test for carbon dioxide. Include the observation for a positive result. test
See it on the paper → - 0973/31 · October/November 2024 · Q2a(v)[1]
a gas made by displacement from an ammonium salt.
See it on the paper → - 0973/41 · May/June 2024 · Q2b(i)[2]
Describe the test for hydrogen gas and the observation for a positive result. test observation
See it on the paper → - 0973/41 · October/November 2023 · Q5c(ii)[2]
Describe the test for carbon dioxide and its positive result. test positive result
See it on the paper → - 0973/41 · October/November 2021 · Q5b(iii)[2]
Describe the test for carbon dioxide gas and its positive result. test result
See it on the paper → - 0973/31 · October/November 2020 · Q11b(ii)[2]
A student wants to distinguish between mixture L and mixture M. Describe a test he can do. Include the results in each case. test result with L
See it on the paper → - 0973/32 · May/June 2020 · Q11c(ii)[2]
The student observes a gas bubbling into solution S. Solution S becomes milky. Identify the gas and solution S. gas solution S
See it on the paper → - 0973/41 · May/June 2020 · Q5b(ii)[2]
Describe the test for chlorine gas and its positive result. test result
See it on the paper → - 0973/31 · May/June 2019 · Q8c(i)[2]
State the name of the gas given off and deduce the identity of solution S. gas solution S
See it on the paper →
What examiners said
This question was answered well. Very occasionally candidates gave the test for oxygen instead.
— Examiner report, May/June 2025, 0973/42 Q6(d) (Cambridge)
The test for carbon dioxide using lime water and giving a positive result of a white precipitate was well known by candidates.
— Examiner report, October/November 2023, 0973/41 Q5(c)(ii) (Cambridge)
Few candidates realised that it was the test for ammonia gas that was needed.
— Examiner report, October/November 2020, 0973/31 Q11(b)(ii) (Cambridge)
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