plumiTests for ions and gases: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on P.1.5 Tests for ions and gases, 2019–2025, with mark schemes and examiner’s reports where available.
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All 51 questions on Tests for ions and gases, as a list
- June 2025, AS Unit 3, Q2(a)(iii) (2 marks): Both lithium ions and strontium ions produce red flame colours, so further tests are required to identify these cations. Explain how a chemical test could be us
- June 2025, AS Unit 3, Q2(b)(i) (2 marks): State the expected observations when acidified silver nitrate is added to each of these ions. (2) Chloride ion Bromide ion Iodide ion
- June 2025, AS Unit 3, Q2(b)(ii) (2 marks): Explain how the identity of the halide ion can be confirmed. (2)
- June 2025, AS Unit 3, Q3(b)(ii) (1 mark): Identify, by name or formula, one ion which might be present in tap water that might cause the formation of a white precipitate on the left-hand side of the fil
- June 2025, Unit 6, Q1(a)(i) (2 marks): Heat a small amount A is a (2) of solid A in a test hydrated salt. 1 tube, holding some cobalt chloride paper at the mouth of the test tube. 2
- June 2025, Unit 6, Q1(a)(ii) (1 mark): Add excess aqueous A pale brown precipitate sodium hydroxide to a forms, which darkens of the cation solution of A and leave to in A is on standing. stand in ai
- June 2025, Unit 6, Q1(a)(iii) (2 marks): A white precipitate forms The formula (2) on adding a mixture of two of the anion in A is Cl–. solutions to a solution of A. The white precipitate dissolves on
- June 2025, Unit 6, Q1(b)(i) (3 marks): Write ionic equations to account for the following observations. State symbols are not required. (3) Formation of green precipitate in Test 1 Formation of gas t
- June 2025, Unit 6, Q1(b)(iii) (1 mark): State the formula of salt B. (1)
- January 2025, AS Unit 3, Q1(a)(i) (4 marks): Describe how the student could use flame colour to confirm that the solid sample contains potassium ions. Outline the experimental procedure, stating the colour
- January 2025, AS Unit 3, Q1(a)(ii) (2 marks): The student dissolved some of the solid sample in deionised water in a test tube. To the test tube, the student added dilute hydrochloric acid followed by aqueo
- January 2025, AS Unit 3, Q1(b)(i) (2 marks): The student warmed some of the solution in a test tube, before adding aqueous sodium hydroxide and holding damp red litmus paper at the mouth of the tube. + . F
- January 2025, AS Unit 3, Q1(b)(ii) (3 marks): To another test tube of the solution, the student added silver nitrate solution. A pale yellow precipitate was observed. The student then added an excess of dil
- October 2024, AS Unit 3, Q1(a)(i) (4 marks): Flame tests can be used to confirm the identity of the cations. Complete the table to show a possible identity for the cations in X, Y and Z, and the colours of
- October 2024, AS Unit 3, Q1(a)(ii) (3 marks): Describe how the presence of chloride ions in the solutions of X, Y and Z could be identified and confirmed. (3)
- October 2024, Unit 6, Q1(a)(i) (4 marks): Complete the table to show, by name or formula, the products of the tests. (4) Test Observation Name or formula of product Aqueous silver nitrate and A yellow p
- October 2024, Unit 6, Q1(a)(ii) (1 mark): A green flame was seen when a flame test was carried out on a sample of solid P. Identify P by name or formula. (1) P
- October 2024, Unit 6, Q1(a)(iii) (2 marks): Give the formulae of the three ions present in Q and hence the formula of compound Q. (2) Ions in Q Formula of Q
- June 2024, Unit 6, Q5(a)(i) (2 marks): Describe how to carry out Step 4. You should identify both how to perform the test and how you would know all the ammonia had been evolved. (2)
- June 2024, Unit 6, Q5(b)(iii) (2 marks): Give a chemical test, with the expected result, to confirm the identity of the halide ion in a sample of NH4X. (2)
- January 2024, Unit 6, Q1(b) (3 marks): Adding dilute nitric acid followed by aqueous silver nitrate to A and B resulted in both forming precipitates. The student was not certain, but suggested that t
- January 2024, Unit 6, Q1(c) (1 mark): The student tested for the anion in C by adding acidified barium nitrate solution and observed a white precipitate. Give the formula of the compound in solution
- January 2024, Unit 6, Q1(d) (1 mark): The student researched further tests for the anion present in D. A test was found which involved the addition of sodium hydroxide solution followed by aluminium
- June 2023, Unit 6, Q1(a)(iii) (1 mark): A few drops of dilute (1) nitric acid were added to 5 cm3 of a fresh sample of P The formula of the A few drops of aqueous A white precipitate silver nitrate we
- June 2023, Unit 6, Q1(b) (2 marks): State why, in the silver nitrate test on P, the nitric acid was not needed in this case. Justify your answer by considering the role of nitric acid in the silve
- June 2023, Unit 6, Q1(c)(ii) (2 marks): Describe a test, and its positive result, that the student could have carried out to show the presence of sulfate ions. (2)
- January 2023, Unit 6, Q1(d)(iii) (2 marks): Explain why, with solution A, the precipitate must be separated before adding aqueous ammonia. (2)
- October 2022, Unit 6, Q1(a)(ii) (1 mark): Add acidified A white precipitate forms X is barium chloride solution
- October 2022, Unit 6, Q2(d)(ii) (1 mark): State how the student could have confirmed that all the ammonia was boiled off in Step 2. (1)
- June 2022, Unit 6, Q1(a)(i) (2 marks): Identify, by name or formula, the salt in A. (2)
- June 2022, Unit 6, Q1(a)(ii) (2 marks): The white precipitate is separated from the solution. Give a test on the precipitate and its positive result to confirm the identity of the anion in A. (2) Test
- June 2022, Unit 6, Q1(b)(i) (1 mark): Identify, by name or formula, the gas given off when B is warmed with aqueous sodium hydroxide. (1)
- June 2022, Unit 6, Q1(b)(ii) (2 marks): Give the formulae of the ions of the salt in B. (2)
- January 2022, AS Unit 3, Q1(a)(i) (1 mark): State what would be seen on the addition of acidified silver nitrate solution to an aqueous solution of NH4Cl. (1)
- January 2022, AS Unit 3, Q1(a)(ii) (2 marks): Describe a test to confirm the presence of NH 4 + ions in a solution of NH4Cl. Include the result of the positive test. (2)
- October 2021, AS Unit 3, Q1(b) (2 marks): An unlabelled bottle was thought to contain solid strontium chloride. A sample of the solid was dissolved in distilled water for tests to identify the anion. Co
- October 2021, AS Unit 3, Q1(d)(iii) (1 mark): Give the test for oxygen and the expected positive result. (1)
- October 2021, Unit 6, Q1(a)(i) (1 mark): Test 1 A few drops of aqueous sodium hydroxide were added to a sample of the copper(II) sulfate solution. State what you would see. (1)
- October 2021, Unit 6, Q1(b) (2 marks): Describe a test, and its positive result, to confirm the presence of the sulfate ion in another sample of the copper(II) sulfate solution. (2)
- June 2021, AS Unit 3, Q1(b) (4 marks): Sodium sulfate and potassium carbonate may also be distinguished using chemical tests. Give a chemical test for each compound which would confirm the identity o
- June 2021, Unit 6, Q1(b)(iv) (2 marks): When the mixture from (b)(iii) is warmed, a gas is evolved. Give a test to identify the gas stating the positive result of the test. (2)
- January 2021, AS Unit 2, Q22(c)(i) (3 marks): Describe a chemical test on a solution of these crystals to confirm that the impurities present are chloride ions rather than bromide ions. Include the expected
- January 2021, AS Unit 3, Q1(a)(i) (1 mark): The student tested each solution using universal indicator paper. Only solution A turned the paper red. Identify solution A. (1)
- January 2021, AS Unit 3, Q1(a)(ii) (1 mark): The student mixed 1 cm3 of solution A separately with 1 cm3 of each of the other solutions. There was no change for three of the mixtures but effervescence was
- January 2021, AS Unit 3, Q1(a)(iv) (3 marks): The student then mixed 1 cm3 samples of the remaining solutions as shown in Table 1. Solutions mixed Observation B and D no change B and E cream precipitate D a
- January 2021, Unit 6, Q1(b)(ii) (1 mark): When A is added to C, vigorous effervescence occurs and the gas produced turns limewater cloudy. Identify, by name or formula, the gas produced. (1)
- January 2021, Unit 6, Q1(b)(iii) (1 mark): Suggest the identity, by name or formula, of the anion in C. (1)
- January 2021, Unit 6, Q1(b)(iv) (2 marks): Identify A by name or formula. Justify your answer. (2)
- January 2021, Unit 6, Q1(b)(v) (2 marks): When A is added to D no change is seen. A small amount of this mixture is added to B and a white precipitate forms. Suggest what can be deduced about solutions
- October 2020, AS Unit 3, Q2(a) (3 marks): A student was provided with aqueous solutions of four compounds: hydrochloric acid potassium carbonate silver nitrate sodium chloride Four bottles, labelled B,
- June 2019, AS Unit 3, Q1(b) (6 marks): Complete the table, giving a chemical test, not involving indicators, and its result for each of the products of the decomposition of ammonium carbonate. (6) Pr
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