0654.C7.1.02 — Describe acids in terms of their effect on the indicators: (a).litmus (b). methyl orange: past paper questions
Real questions on 0654.c7.1.02 — describe acids in terms of their effect on the indicators: (a).litmus (b). methyl orange
The newest 5 of 5 written questions. Open one to see it on the real paper.
- 0973/31 · October/November 2025 · Q7d(ii)[2]
Describe the chemical test for hydrogen and state the observation for a positive result. test observation Question 8 starts on the next page.
See it on the paper → - 0973/31 · May/June 2025 · Q6c(i)[2]
Describe the effect of dilute sulfuric acid on: blue litmus indicator methyl orange indicator.
See it on the paper → - 0973/31 · May/June 2025 · Q6c(ii)[1]
Suggest the pH of dilute sulfuric acid. pH =
See it on the paper → - 0973/31 · May/June 2025 · Q6c(iii)[1]
State the two products of the neutralisation reaction between an acid and an alkali.
See it on the paper → - 0973/31 · May/June 2020 · Q2b(i)[1]
Water is neutral. State the pH value of water.
See it on the paper →
What examiners said
The colour change of litmus was well known. Very few candidates knew the colour change for methyl orange, with many guessing orange.
— Examiner report, May/June 2025, 0973/31 Q6(c)(i) (Cambridge)
Most candidates stated a figure in the correct range. A wide range of numbers outside this were also given, many not even on the pH scale.
— Examiner report, May/June 2025, 0973/31 Q6(c)(ii) (Cambridge)
This was not well known with a range of unrelated answers seen.
— Examiner report, May/June 2025, 0973/31 Q6(c)(iii) (Cambridge)
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