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Qualitative Analysis · CSEC Chemistry

110 past-paper questions on Qualitative Analysis, part of Inorganic Chemistry, from every CSEC Chemistry paper on Quelpr.

Practise Qualitative Analysis
  1. 1(b)3 marks· Chemistry Q1 1(b)Complete Table 2 below for tests carried out on the mixture labelled as Q.
  2. 1(b)5 marks· Chemistry Q1 1(b)Complete Table 2 by filling in the missing observations and inferences.
  3. 1(b)7 marks· Chemistry Q1 1(b)A student carries out the following tests on a solid, Q, and makes the observations recorded in Table 2 below. Complete Table 2 to show all possible inferences and write ionic equations where required.
  4. 1(b)5 marks· Chemistry Q1 1(b)Complete Table 2 to show the remaining observations and inferences made by the student.
  5. 1(b)1 mark· Chemistry Q1 1(b)Complete Table 2 by filling in the inferences that could be made based on the observations recorded.
  6. 1(b)8 marks· Chemistry Q1 1(b)Complete Table 2 by inserting the appropriate inferences.
  7. 1(b)3 marks· Chemistry Q1 1(b)Complete Table 2 by writing the observations for the tests carried out on Salt S.
  8. 1(b)(i)10 marks· Chemistry Q1 1(b)(i)Heat a small portion of solid Y in a test tube, gently at first and then strongly. Observations: colourless gas evolved with a choking odour; turns acidified potassium dichromate solution from orange to green.…
  9. 1(b)(i)2 marks· Chemistry Q1 1(b)(i)Complete Table 2 for the test: To solid Q, add water, stir, filter and then divide the filtrate into four portions. Retain and dry the residue for test (vi) below.
  10. 1(b)(i)1 mark· Chemistry Q1 1(b)(i)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: A sample of Solid W is moistened with sodium hydroxide solution and the mixture heated. Moist red and moist blue litmus are held…
  11. 1(b)(i)8 marks· Chemistry Q1 1(b)(i)Complete Table 2, row 1, inference (i).
  12. 1(b)(i)7 marks· Chemistry Q1 1(b)(i)Heat a small sample of solid Z gently in a dry test tube. Observation: Pungent gas evolves which turns damp red litmus blue. Inference: (equation required).
  13. 1(b)(i)1 mark· Chemistry Q1 1(b)(i)Identify Solution X.
  14. 1(b)(i)2 marks· Chemistry Q1 1(b)(i)Complete Table 2 to show all of the possible inferences and write ionic equations where indicated.
  15. 1(b)(ii)10 marks· Chemistry Q1 1(b)(ii)To the remaining portion of solid Y, add 20 cm³ of distilled water, stir to dissolve and filter. Collect the filtrate and divide into three (3) equal portions. Observations: filtrate is pale green in colour. Inferences:
  16. 1(b)(ii)2 marks· Chemistry Q1 1(b)(ii)Complete Table 2 for the test: To the first portion of the filtrate from (i) above, add aqueous NaOH until in excess. The observations are: White precipitate formed. Precipitate soluble in excess aqueous NH₃. The…
  17. 1(b)(ii)2 marks· Chemistry Q1 1(b)(ii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a few drops of acidified silver nitrate are added, followed by aqueous ammonia. Observation: White…
  18. 1(b)(ii)8 marks· Chemistry Q1 1(b)(ii)Complete Table 2, row 2, observation (ii).
  19. 1(b)(ii)7 marks· Chemistry Q1 1(b)(ii)Add approximately 2 cm³ of aqueous sodium hydroxide to a sample of solid Z and warm. Observation: A gas evolves which forms dense white fumes with hydrogen chloride. Inference: (equation required).
  20. 1(b)(ii)2 marks· Chemistry Q1 1(b)(ii)Identify ONE flaw in the procedure that Paul used for carrying out EACH test.
  21. 1(b)(ii)1 mark· Chemistry Q1 1(b)(ii)Suggest a possible identity of the solid, R:
  22. 1(b)(iii)10 marks· Chemistry Q1 1(b)(iii)To the first portion of the filtrate from (b) above, add aqueous sodium hydroxide slowly until in excess. Observations: a green precipitate is formed; insoluble in excess aqueous sodium hydroxide. Inferences:
  23. 1(b)(iii)3 marks· Chemistry Q1 1(b)(iii)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: To an aqueous solution of W, a solution containing barium ions is added. Observation: A white precipitate is formed.
  24. 1(b)(iii)2 marks· Chemistry Q1 1(b)(iii)Complete Table 2 for the test: To the second portion of the filtrate from (i) above, add aqueous KI. The observation is: Yellow precipitate formed. Provide the ionic equation required for the inference.
  25. 1(b)(iii)8 marks· Chemistry Q1 1(b)(iii)Complete Table 2, row 3, inference (iii).
  26. 1(b)(iii)7 marks· Chemistry Q1 1(b)(iii)Dissolve a spatula full of solid Z in approximately 10 cm³ of deionized water. Divide the resulting mixture into 3 portions for tests iv - vi. Observation: A pale green solution is formed. Inference: (equation required).
  27. 1(b)(iii)2 marks· Chemistry Q1 1(b)(iii)Write a balanced equation for the reaction occurring in Tube 1. Balanced equation:
  28. 1(b)(iv)10 marks· Chemistry Q1 1(b)(iv)To the second portion of the filtrate from (b) above, add aqueous silver nitrate followed by aqueous ammonia. Observations: white precipitate is formed; insoluble in aqueous ammonia. Inferences (ionic equation required):
  29. 1(b)(iv)1 mark· Chemistry Q1 1(b)(iv)Complete Table 2 for the test: To the third portion of the filtrate from (i) above, add aqueous AgNO₃, followed by aqueous NH₃. The observation is: No observable change. Provide the inference.
  30. 1(b)(iv)2 marks· Chemistry Q1 1(b)(iv)Complete Table 2 below by writing the inferences for tests carried out on Solid W. Test: Dilute hydrochloric acid is added to the mixture from (iii) above. Observation: The precipitate is insoluble in the acid. (Ionic…
  31. 1(b)(iv)8 marks· Chemistry Q1 1(b)(iv)Complete Table 2, row 4, inference (iv).
  32. 1(b)(iv)4 marks· Chemistry Q1 1(b)(iv)Explain why nitric acid instead of sulphuric acid is used in the experiment in Tube 1 in order to obtain a positive test result.
  33. 1(b)(iv)7 marks· Chemistry Q1 1(b)(iv)To one portion of solution Z from (iii) above, add aqueous sodium hydroxide dropwise until in excess. Observation: A green gelatinous precipitate forms. The precipitate is insoluble in excess sodium hydroxide.…
  34. 1(b)(v)1 mark· Chemistry Q1 1(b)(v)Suggest the possible identity of Q.
  35. 1(b)(v)10 marks· Chemistry Q1 1(b)(v)To the third portion of the filtrate from (b) above, add aqueous barium nitrate followed by aqueous nitric acid. Observations: a white precipitate is formed; precipitate readily dissolves in aqueous nitric acid with the…
  36. 1(b)(v)2 marks· Chemistry Q1 1(b)(v)Complete Table 2 for the test: To the fourth portion of the filtrate from (i) above, add aqueous AgNO₃, followed by aqueous NH₃. Provide the ionic equation required for the inference.
  37. 1(b)(v)8 marks· Chemistry Q1 1(b)(v)Complete Table 2, row 4, observation (v).
  38. 1(b)(v)7 marks· Chemistry Q1 1(b)(v)To another portion of solution Z from (iii) above, add dilute nitric acid followed by aqueous silver nitrate solution. Observation: No visible reaction seen. Inference: (ionic equation required).
  39. 1(b)(vi)2 marks· Chemistry Q1 1(b)(vi)Complete Table 2 for the test: To the dried residue from (i) above, add dilute HNO₃, warm, filter and then divide the filtrate into two portions. The observations are: Vigorous effervescence observed upon addition of…
  40. 1(b)(vi)7 marks· Chemistry Q1 1(b)(vi)To another portion of solution Z from (iii) above, add barium nitrate followed by dilute nitric acid. Observation: A white precipitate insoluble in dilute acid is produced. Inference: (ionic equation required).
  41. 1(b)(vii)2 marks· Chemistry Q1 1(b)(vii)Complete Table 2 for the test: To the first portion of the filtrate from (vi) above, add aqueous NaOH until in excess. The inference is: Cu²⁺ ions present. Provide the ionic equation required for the inference.
  42. 1(b)(viii)1 mark· Chemistry Q1 1(b)(viii)Andrew wanted to identify the gas produced. He placed a lighted splint in a sample of the gas, which extinguished with a 'squeaky pop'. Deduce the identity of the gas.
  43. 1(b)(viii)2 marks· Chemistry Q1 1(b)(viii)Complete Table 2 for the test: To the second portion of the filtrate from (vi) above, add aqueous NH₃ until in excess. The inference is: Cu²⁺ ions present.
  44. 1(c)6 marks· Chemistry Q1 1(c)A number of tests were carried out on an aqueous solution of Compound R. The observations obtained are recorded in Table 2. Write suitable inferences and ionic equations for EACH reaction in the spaces provided.
  45. 1(c)3 marks· Chemistry Q1 1(c)Complete Table 2 by inserting the inference and writing an ionic equation as indicated.
  46. 1(c)(i)3 marks· Chemistry Q1 1(c)(i)Complete Table 2 by inserting the inferences or observations as necessary for the test: Q is heated strongly in a boiling tube. A glowing splint is placed at the mouth of the boiling tube. The gases evolved are bubbled…
  47. 1(c)(i)1 mark· Chemistry Q1 1(c)(i)Identify Solution Y.
  48. 1(c)(i)1 mark· Chemistry Q1 1(c)(i)To a sample of solution P, dilute nitric acid is added, followed by a few drops of silver nitrate solution. Inference: No Cl⁻, Br⁻ or I⁻ ions present.
  49. 1(c)(ii)2 marks· Chemistry Q1 1(c)(ii)Complete Table 2 by inserting the inferences or observations as necessary for the test: Dilute HCl is added in excess to Q and the mixture warmed. To the resulting solution, aqueous NaOH is added until in excess. (Ionic…
  50. 1(c)(ii)3 marks· Chemistry Q1 1(c)(ii)With reference to Solution Y identified in (i) above, explain the changes that would be observed in Flask 2 if the unknown substance contained the sulfite ion. Expected changes: Explanation:
  51. 1(c)(ii)1 mark· Chemistry Q1 1(c)(ii)To a sample of solution P, a few copper turnings are added, followed by concentrated sulphuric acid. Observation: Brown fumes evolve which turn moist blue litmus red. Inference: (missing)
  52. 1(c)(iii)3 marks· Chemistry Q1 1(c)(iii)Complete Table 2 by inserting the inferences or observations as necessary for the test: Dilute nitric acid followed by a few drops of silver nitrate solution was added to Q. The test tube was left standing in light for…
  53. 1(c)(iii)2 marks· Chemistry Q1 1(c)(iii)Describe Observation 3 as indicated in Table 2.
  54. 1(c)(iii)1 mark· Chemistry Q1 1(c)(iii)How would you modify the experiment to confirm the presence of carbonate instead of the sulfite ion?
  55. 1(c)(iii)1 mark· Chemistry Q1 1(c)(iii)To a sample of solution P, a few drops of acidified aqueous potassium manganate (VII) solution are added. Observation: (missing) Inference: The potassium manganate (VII) solution changes from purple to colourless.
  56. 1(c)(iv)2 marks· Chemistry Q1 1(c)(iv)A student suggests that solid sea salt contains chloride ions. How would you go about testing for chloride ions in the solid sea salt?
  57. 1(c)(iv)2 marks· Chemistry Q1 1(c)(iv)To a sample of solution P, aqueous sodium hydroxide is added, until in excess. Observation: A green precipitate forms. The precipitate is insoluble in excess sodium hydroxide. Inference: (missing) (Ionic equation…
  58. 1(d)4 marks· Chemistry Q1 1(d)Complete the table by inserting the appropriate inferences.
  59. 1(f)2 marks· Chemistry Q1 1(f)Describe a confirmatory test for carbon dioxide.
  60. 1(g)1 mark· Chemistry Q1 1(g)Complete Table 2 to show the observations and inferences from tests carried out on a solution, M.
  61. 1(k)(i)2 marks· Chemistry Q1 1(k)(i)Aqueous sodium hydroxide was added dropwise, and then in excess. Inference: Fe²⁺ ions present.
  62. 1(k)(iii)2 marks· Chemistry Q1 1(k)(iii)Aqueous barium nitrate was added, followed by dilute nitric acid. Inference: SO4²⁻ ions present.
  63. 2(c)(ii)2 marks· Chemistry Q2 2(c)(ii)Describe the colour change that the student observed.
  64. 2(d)(iii)2 marks· Chemistry Q2 2(d)(iii)Describe a simple laboratory test for chlorine gas.
  65. 3(a)(v)1 mark· Chemistry Q3 3(a)(v)Briefly describe ONE test that can be used to identify the gaseous by-product.
  66. 3(b)(iii)2 marks· Chemistry Q3 3(b)(iii)Describe ONE chemical test that could be used to identify the gas given off from the reaction of Compound E with solid calcium carbonate. Include the expected observation.
  67. 3(f)2 marks· Chemistry Q3 3(f)Describe ONE test that could be used to identify the gas that is produced in the reaction of Compound C with sodium.
  68. 4(a)(ii)b)2 marks· Chemistry Q4 4(a)(ii)b)Outline ONE test that can be used to identify any gas that is produced during the reaction.
  69. 4(c)(ii)4 marks· Chemistry Q4 4(c)(ii)Other than electrolysis, describe a suitable laboratory procedure that could be used to obtain a sample of dry copper from a sample of the alloy.
  70. 5(a)5 marks· Chemistry Q5 5(a)Explain how the tests above can be used to distinguish among the gases, hydrogen, chlorine and nitrogen. Include observations in your answer.
  71. 5(a)(iii)2 marks· Chemistry Q5 5(a)(iii)Comment on the suitability of using the moist blue litmus paper to identify ammonia gas.
  72. 5(a)(iv)4 marks· Chemistry Q5 5(a)(iv)Instead of the litmus test used above, describe ONE OTHER chemical test that can be used to identify ammonia gas. Write a balanced equation to represent the chemical test you have described.
  73. 5(b)(i)4 marks· Chemistry Q5 5(b)(i)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (i) Acidified potassium manganate (VII) with gas from sodium sulphite.
  74. 5(b)(ii)4 marks· Chemistry Q5 5(b)(ii)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (ii) Aqueous calcium hydroxide with gas from sodium carbonate.
  75. 5(b)(ii)2 marks· Chemistry Q5 5(b)(ii)Describe a suitable test for identifying ammonia.
  76. 5(b)(iii)4 marks· Chemistry Q5 5(b)(iii)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (iii) Damp blue litmus with gas from sodium sulphite.
  77. 5(b)(iv)4 marks· Chemistry Q5 5(b)(iv)Describe the observations expected from tests (i) – (iv) in Table 2. Observations from: (iv) Damp blue litmus with gas from sodium carbonate.
  78. 5(c)1 mark· Chemistry Q5 5(c)Suggest ONE way to verify the identity of the gas given off in (a).
  79. 5(c)2 marks· Chemistry Q5 5(c)Briefly describe a laboratory test for ammonia gas.
  80. 5(c)(ii)2 marks· Chemistry Q5 5(c)(ii)Describe ONE test that could be used to identify the gas.
  81. 6(b)2 marks· Chemistry Q6 6(b)Water exists in liquid, solid and gaseous states. Describe a laboratory test for water vapour.
  82. 6(c)(i)1 mark· Chemistry Q6 6(c)(i)What colour change would you expect at the end point in BOTH cases?
  83. 7(b)1 mark· Chemistry Q7 7(b)For which ions is the student MOST likely testing?
  84. 7(b)(i)2 marks· Chemistry Q7 7(b)(i)Briefly describe the test for the presence of ammonium ions in a soil sample.
  85. 2(c)2 marks· CSEC Chemistry · January 2002 · Paper 2Describe how it can be confirmed that the gas produced in Experiment I is oxygen.
  86. 4(c) [P2]2 marks· CSEC Chemistry · January 2002 · Paper 2How would you show that the gas produced is carbon dioxide?
  87. 5(e) [P2]2 marks· CSEC Chemistry · January 2002 · Paper 2What would you expect to observe if a sample of ammonia gas collected were bubbled into aqueous copper(II) sulphate until no further change took place?
  88. Q101 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1When a compound is treated with concentrated hydrochloric acid, a greenish-yellow gas which bleaches moist red litmus paper is given off. The gas given off is
  89. Q211 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1A solution of iron(II) sulfate was added until in EXCESS to a solution of barium nitrate. The precipitate produced was filtered off and water was added to the residue in the filter paper. The colour of the precipitate…
  90. Q221 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1A solution of iron(II) sulfate was added until in EXCESS to a solution of barium nitrate. The precipitate produced was filtered off and water was added to the residue in the filter paper. Water was added to the residue…
  91. Q441 mark · multiple choice· CSEC Chemistry · January 2017 · Paper 1Which of the following aqueous solutions will produce a yellow precipitate with aqueous potassium iodide?
  92. Q151 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1A salt was heated with a certain base. The gas evolved turned moist red litmus paper blue. Which of the following ions does the salt contain?
  93. Q361 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1Which of the following gases forms white fumes when a glass rod, dipped in aqueous ammonia, is held in it?
  94. Q431 mark · multiple choice· CSEC Chemistry · January 2018 · Paper 1A suitable reagent that could be used at stage IV is
  95. Q351 mark · multiple choice· CSEC Chemistry · January 2019 · Paper 1The gas given off is
  96. 6(a)(i)2 marks· CSEC Chemistry · January 2021 · Paper 2Describe a test that could be used to identify the gaseous product formed.
  97. Q221 mark · multiple choice· CSEC Chemistry · May/June 2010 · Paper 1A substance P, has the following properties. I. It is insoluble in water. II. A gas is evolved when P is added to dilute acids. III. P gives off a gas when heated. P is MOST likely
  98. Q381 mark · multiple choice· CSEC Chemistry · May/June 2011 · Paper 1The gas given off is
  99. Q411 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1Which of the following observations is expected when aqueous silver nitrate is added to aqueous potassium chloride?
  100. Q441 mark · multiple choice· CSEC Chemistry · May/June 2013 · Paper 1Which of the aqueous solutions below produces a yellow precipitate with aqueous potassium iodide?
  101. Q441 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1Which of the following processes produces a gas which is different from the others?
  102. Q531 mark · multiple choice· CSEC Chemistry · May/June 2015 · Paper 1Which of the following observations is expected when aqueous silver nitrate is added to aqueous potassium chloride?
  103. Q351 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following pairs of reagents will result in the formation of yellow precipitate?
  104. Q371 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following procedures can be used to identify ammonia gas?
  105. Q391 mark · multiple choice· CSEC Chemistry · May/June 2016 · Paper 1Which of the following aqueous solutions will produce a blue precipitate with aqueous sodium hydroxide?
  106. Q271 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1Which test can be used to identify an acidic gas?
  107. Q281 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1Which test can be used to identify ammonia gas?
  108. Q511 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1When copper(II) carbonate is heated alone in a dry test tube, a gas is evolved and a black residue is formed. This gas is expected to
  109. Q531 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1Which of the following observations is likely when EXCESS aqueous ammonia is added to a solution of copper(II) sulfate and the mixture is shaken?
  110. Q581 mark · multiple choice· CSEC Chemistry · May/June 2017 · Paper 1Which of the following observations is expected when aqueous silver nitrate is added to aqueous potassium chloride?

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