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Identification of Cations and Anions · CAPE Chemistry Unit 1

27 past-paper questions on Identification of Cations and Anions, part of Chemistry of the Elements, from every CAPE Chemistry Unit 1 paper on Quelpr.

Practise Identification of Cations and Anions
  1. 1(f)(i)2 marks· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2Write the simplest ionic equation for the formation of the yellow precipitate when silver nitrate solution acidified with dilute nitric acid is added to an aqueous solution containing iodide ions.
  2. 1(f)(iii)1 mark· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2State why the silver nitrate solution is acidified when testing for iodide ions.
  3. 1(f)(iv)1 mark· CAPE Chemistry Unit 1 · May/June 2023 · Paper 2Explain why dilute hydrochloric acid is not used to acidify the silver nitrate solution in this test for iodide ions.
  4. 3(c)5 marks· CAPE Chemistry Unit 1 · May/June 2026 · Paper 2Complete Table 5 by writing the observations based on the deductions written for the cation and anion in Compound S.
  5. 1(a)3 marks· Chemistry · Unit 1 Q1 1(a)Heat strongly a small quantity of R and allow to cool. Test for gas evolved. Observe residue.
  6. 1(b)2 marks· Chemistry · Unit 1 Q1 1(b)To a small sample of R, add dilute HCl and warm.
  7. 1(c)2 marks· Chemistry · Unit 1 Q1 1(c)To another small sample of R, add concentrated H₂SO₄ and heat carefully.
  8. 1(c)5 marks· Chemistry · Unit 1 Q1 1(c)Complete the table by inserting the missing observations or inferences.
  9. 1(d)(i)3 marks· Chemistry · Unit 1 Q1 1(d)(i)Dissolve a spatula-full of R in minimum volume of dilute hydrochloric acid (warming if needed). Dilute with water to half of a test tube. Divide the solution into two portions and carry out the following tests. To the…
  10. 1(d)(i)2 marks· Chemistry · Unit 1 Q1 1(d)(i)Describe simple tests that could be used to confirm that the products of the combustion of A are water and carbon dioxide (You must include in your answer the reagent used and the observation obtained for EACH test).…
  11. 1(d)(ii)1 mark· Chemistry · Unit 1 Q1 1(d)(ii)To the second sample of the solution add AgNO₃(aq).
  12. 1(d)(ii)2 marks· Chemistry · Unit 1 Q1 1(d)(ii)Describe simple tests that could be used to confirm that the products of the combustion of A are water and carbon dioxide (You must include in your answer the reagent used and the observation obtained for EACH test).…
  13. 1(e)1 mark· Chemistry · Unit 1 Q1 1(e)Write the chemical formula for the other product formed with water when excess NaOH(aq) is added in (d) (i).
  14. 3(a)(i)2 marks· Chemistry · Unit 1 Q3 3(a)(i)Outline TWO reasons why aqueous hydroxide ions, OH⁻(aq), are used in the identification of cations.
  15. 3(a)(ii)2 marks· Chemistry · Unit 1 Q3 3(a)(ii)Complete the table.
  16. 3(b)5 marks· Chemistry · Unit 1 Q3 3(b)Complete Table 2 by writing the relevant observations.
  17. 3(c)5 marks· Chemistry · Unit 1 Q3 3(c)Complete Table 2 to show the student's record of the observations made.
  18. 3(c)(ii)2 marks· Chemistry · Unit 1 Q3 3(c)(ii)Identify the salts in mixture M.
  19. 3(d)2 marks· Chemistry · Unit 1 Q3 3(d)Describe a test to identify Pb²⁺ ions in solution.
  20. 3(d)2 marks· Chemistry · Unit 1 Q3 3(d)The products of the reaction in (c) (i) above were passed into water and the resultant solution treated with AgNO3(aq) followed by aqueous ammonia. State what would be observed.
  21. 3(d)(i)5 marks· Chemistry · Unit 1 Q3 3(d)(i)Complete the table below by writing the colour of the species labelled A, B, C, D and E in Figure 3.
  22. 3(d)(ii)1 mark· Chemistry · Unit 1 Q3 3(d)(ii)Write the formula of Species E.
  23. 3(e)2 marks· Chemistry · Unit 1 Q3 3(e)State the changes that would be observed when a solution of copper(II) ions is treated with concentrated hydrochloric acid followed by concentrated ammonia.
  24. 6(c)(iii)2 marks· Chemistry · Unit 1 Q6 6(c)(iii)Describe an additional simple test to confirm the identity of the halide ion in A.
  25. 261 mark· Chemistry · Unit 1 Q26 26Which of the following aqueous reagents can be used to distinguish between a soluble carbonate and a soluble sulfate?
  26. 391 mark· Chemistry · Unit 1 Q39 39The ionic equation for the formation of chromium hydroxide from chromium(III) sulfate and dilute NH₃ (aq) is
  27. 391 mark· Chemistry · Unit 1 Q39 39The ionic equation for the formation of chromium hydroxide from chromium(III) sulfate and dilute NH₃(aq) is

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