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Identification of ions and gases: CAIE IGCSE Chemistry questions

Every CAIE IGCSE Chemistry exam question on 12.5 Identification of ions and gases, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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407 questions

  1. Q40

    June 2024 · Paper 1

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 1, question 40: A salt, S, is dissolved in water and three tests are carried out on the solution formed. test result aqueous sodium hydroxide is green precipitate forms, insolu

  2. Q2(c)

    June 2024 · Paper 3

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 3, question 2(c): Describe the observations when aqueous sodium hydroxide is added dropwise to a solution containing calcium ions until the sodium hydroxide is in excess. obser

  3. Q5(b)

    June 2024 · Paper 4

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 4, question 5(b): When iron(II) sulfate crystals are heated strongly, sulfur dioxide gas is given off. Describe a test for sulfur dioxide gas. test observations [2]

  4. Q3(a)

    June 2024 · Paper 6

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 6, question 3(a): To the first portion of solution E, the student adds aqueous sodium hydroxide dropwise and then in excess. observations adding dropwise observation in excess [

  5. Q3(b)

    June 2024 · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 6, question 3(b): To the second portion of solution E, the student adds about 1 cm3 of dilute nitric acid and a few drops of aqueous silver nitrate. observations [1] 10 Tests o

  6. Q3(d)

    June 2024 · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 6, question 3(d): From the tests and observations in Table 3.1 it is not possible to identify the cation in solid F. Give another test that can be carried out to help identify

  7. Q3(e)

    June 2024 · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    June 2024 Paper 6, question 3(e): Identify the anion in solid F. [1] [Total: 7]

  8. Q27

    Specimen · Paper 2

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 2, question 27: Which metal compound produces a gas that turns limewater milky when it is heated with a Bunsen burner? A copper(II) carbonate B magnesium nitrate C sodium sulfa

  9. Q2(a)(iv)

    Specimen · Paper 3

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 3, question 2(a)(iv): Describe a test for chloride ions. test positive result [2]

  10. Q2(e)

    Specimen · Paper 4

    2 marks3.1 Formulae12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 4, question 2(e): Aqueous silver nitrate is added to aqueous magnesium chloride. A white precipitate forms. Write an ionic equation for this reaction. Include state symbols. [2]

  11. Q1(b)

    Specimen · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 1(b): The gas made in the reaction is hydrogen. Describe how the student can test that the gas is hydrogen. Give the expected result of the test. test result [1] 3 Fi

  12. Q3(a)

    Specimen · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 3(a): To the first portion of solution C, the student adds 1 cm3 of dilute nitric acid followed by a few drops of aqueous silver nitrate. observations [1]

  13. Q3(b)

    Specimen · Paper 6

    1 mark12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 3(b): To the second portion of solution C, the student adds 1 cm3 of dilute nitric acid followed by a few drops of aqueous barium nitrate. observations [1]

  14. Q3(c)

    Specimen · Paper 6

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 3(c): To the third portion of solution C, the student adds aqueous ammonia dropwise and then in excess. observations [2] 8 tests on solid D Table 3.1 shows the tests

  15. Q3(d)

    Specimen · Paper 6

    3 marks12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 3(d): Describe how to do the flame test used in test 1. [3]

  16. Q3(e)

    Specimen · Paper 6

    2 marks12.5 Identification of ions and gases
    The whole paper ↗
    Specimen Paper 6, question 3(e): Identify solid D. [2] [Total: 9]
All 16 questions on Identification of ions and gases, as a list
  1. June 2024, Paper 1, Q40 (1 mark): A salt, S, is dissolved in water and three tests are carried out on the solution formed. test result aqueous sodium hydroxide is green precipitate forms, insolu
  2. June 2024, Paper 3, Q2(c) (2 marks): Describe the observations when aqueous sodium hydroxide is added dropwise to a solution containing calcium ions until the sodium hydroxide is in excess. obser
  3. June 2024, Paper 4, Q5(b) (2 marks): When iron(II) sulfate crystals are heated strongly, sulfur dioxide gas is given off. Describe a test for sulfur dioxide gas. test observations [2]
  4. June 2024, Paper 6, Q3(a) (2 marks): To the first portion of solution E, the student adds aqueous sodium hydroxide dropwise and then in excess. observations adding dropwise observation in excess [
  5. June 2024, Paper 6, Q3(b) (1 mark): To the second portion of solution E, the student adds about 1 cm3 of dilute nitric acid and a few drops of aqueous silver nitrate. observations [1] 10 Tests o
  6. June 2024, Paper 6, Q3(d) (1 mark): From the tests and observations in Table 3.1 it is not possible to identify the cation in solid F. Give another test that can be carried out to help identify
  7. June 2024, Paper 6, Q3(e) (1 mark): Identify the anion in solid F. [1] [Total: 7]
  8. Specimen, Paper 2, Q27 (1 mark): Which metal compound produces a gas that turns limewater milky when it is heated with a Bunsen burner? A copper(II) carbonate B magnesium nitrate C sodium sulfa
  9. Specimen, Paper 3, Q2(a)(iv) (2 marks): Describe a test for chloride ions. test positive result [2]
  10. Specimen, Paper 4, Q2(e) (2 marks): Aqueous silver nitrate is added to aqueous magnesium chloride. A white precipitate forms. Write an ionic equation for this reaction. Include state symbols. [2]
  11. Specimen, Paper 6, Q1(b) (1 mark): The gas made in the reaction is hydrogen. Describe how the student can test that the gas is hydrogen. Give the expected result of the test. test result [1] 3 Fi
  12. Specimen, Paper 6, Q3(a) (1 mark): To the first portion of solution C, the student adds 1 cm3 of dilute nitric acid followed by a few drops of aqueous silver nitrate. observations [1]
  13. Specimen, Paper 6, Q3(b) (1 mark): To the second portion of solution C, the student adds 1 cm3 of dilute nitric acid followed by a few drops of aqueous barium nitrate. observations [1]
  14. Specimen, Paper 6, Q3(c) (2 marks): To the third portion of solution C, the student adds aqueous ammonia dropwise and then in excess. observations [2] 8 tests on solid D Table 3.1 shows the tests
  15. Specimen, Paper 6, Q3(d) (3 marks): Describe how to do the flame test used in test 1. [3]
  16. Specimen, Paper 6, Q3(e) (2 marks): Identify solid D. [2] [Total: 9]

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