Required practical – Test for ions.

Last updated: 02/11/2022

AQA A-Level Chemistry Required practicals Required practical – Test for ions.

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Question 1 of 48

1. Question
How do you test for metal ions?
- Add a solution of ammonia or sodium hydroxide
- Add a solution of phosphoric acid or sodium hydroxide
- Add a solution of ammonia or hydrochloric acid
- Add a solution of silver nitrate or ammonia
Correct

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Question 2 of 48

2. Question
Which solution should be added to test for a metal ion?
- Sodium hydroxide
- Hydrochloric acid
- Barium sulfate
- Phosphoric acid
Correct

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Question 3 of 48

3. Question
Which solution should be added to test for a metal ion?
- Ammonia
- Ammonium hydroxide
- Sulfuric acid
- Potassium chloride
Correct

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Question 4 of 48

4. Question
What colour precipitate is formed when aqueous sodium hydroxide is added to Cu $^{2+}$ ions?
- Blue precipitate
- Green precipitate
- Brown precipitate
- Yellow precipitate
Correct

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Question 5 of 48

5. Question
What colour precipitate is formed when aqueous sodium hydroxide is added to Fe $^{2+}$ ions?
- Green precipitate
- Blue precipitate
- Brown precipitate
- Yellow precipitate
Correct

Incorrect
Question 6 of 48

6. Question
What colour precipitate is formed when aqueous sodium hydroxide is added to Fe $^{3+}$ ions?
- Orange precipitate
- Blue precipitate
- Brown precipitate
- Green precipitate
Correct

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Question 7 of 48

7. Question
What colour precipitate is formed when aqueous sodium hydroxide is added to Mn $^{2+}$ ions?
- Pink precipitate
- Orange precipitate
- Blue precipitate
- Green precipitate
Correct

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Question 8 of 48

8. Question
What colour precipitate is formed when aqueous sodium hydroxide is added to Cr $^{3+}$ ions?
- Green precipitate
- Pink precipitate
- Blue precipitate
- Orange precipitate
Correct

Incorrect
Question 9 of 48

9. Question
What colour precipitate is formed when aqueous ammonia is added to Cu $^{2+}$ ions?
- Blue precipitate
- Pink precipitate
- Green precipitate
- Orange precipitate
Correct

Incorrect
Question 10 of 48

10. Question
What colour precipitate is formed when aqueous ammonia is added to Fe $^{2+}$ ions?
- Green precipitate
- Orange precipitate
- Blue precipitate
- Pink precipitate
Correct

Incorrect
Question 11 of 48

11. Question
What colour precipitate is formed when aqueous ammonia is added to Fe $^{3+}$ ions?
- Orange precipitate
- Green precipitate
- Blue precipitate
- Pink precipitate
Correct

Incorrect
Question 12 of 48

12. Question
What colour precipitate is formed when aqueous ammonia is added to Mn $^{2+}$ ions?
- Pink precipitate
- Green precipitate
- Blue precipitate
- Orange precipitate
Correct

Incorrect
Question 13 of 48

13. Question
What colour precipitate is formed when aqueous ammonia is added to Cr $^{3+}$ ions?
- Green precipitate
- Pink precipitate
- Blue precipitate
- Orange precipitate
Correct

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Question 14 of 48

14. Question
What happens when a solution of Cu $^{2+}$ ions reacts with excess aqueous ammonia?
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a purple solution
- Nothing
Correct

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Question 15 of 48

15. Question
What happens when a solution of Fe $^{2+}$ ions reacts with excess aqueous ammonia?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a purple solution
- Precipitate re-dissolves into a dark blue solution
Correct

Incorrect
Question 16 of 48

16. Question
What happens when a solution of Fe $^{3+}$ ions reacts with excess aqueous ammonia?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a purple solution
- Precipitate re-dissolves into a dark blue solution
Correct

Incorrect
Question 17 of 48

17. Question
What happens when a solution of Mn $^{2+}$ ions reacts with excess aqueous ammonia?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a purple solution
- Precipitate re-dissolves into a dark blue solution
Correct

Incorrect
Question 18 of 48

18. Question
What happens when a solution of Cr $^{3+}$ ions reacts with excess aqueous ammonia?
- Precipitate re-dissolves into a purple solution
- Precipitate re-dissolves into a dark green solution
- Nothing
- Precipitate re-dissolves into a dark blue solution
Correct

Incorrect
Question 19 of 48

19. Question
What happens when a solution of Cu $^{2+}$ ions reacts with excess sodium hydroxide?
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a dark green solution
- Nothing
- Precipitate re-dissolves into a purple solution
Correct

Incorrect
Question 20 of 48

20. Question
What happens when a solution of Fe $^{2+}$ ions reacts with excess sodium hydroxide?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a purple solution
Correct

Incorrect
Question 21 of 48

21. Question
What happens when a solution of Fe $^{3+}$ ions reacts with excess sodium hydroxide?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a purple solution
Correct

Incorrect
Question 22 of 48

22. Question
What happens when a solution of Mn $^{2+}$ ions reacts with excess sodium hydroxide?
- Nothing
- Precipitate re-dissolves into a dark green solution
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a purple solution
Correct

Incorrect
Question 23 of 48

23. Question
What happens when a solution of Cr $^{3+}$ ions reacts with excess sodium hydroxide?
- Precipitate re-dissolves into a dark green solution
- Nothing
- Precipitate re-dissolves into a dark blue solution
- Precipitate re-dissolves into a purple solution
Correct

Incorrect
Question 24 of 48

24. Question
What colour is a solution containing Cu $^{2+}$ ions?
- Pale blue solution
- Pale green solution
- Pale pink solution
- Yellow solution
Correct

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Question 25 of 48

25. Question
What colour is a solution containing Fe $^{2+}$ ions?
- Pale green solution
- Pale blue solution
- Pale pink solution
- Yellow solution
Correct

Incorrect
Question 26 of 48

26. Question
What colour is a solution containing Fe $^{3+}$ ions?
- Yellow solution
- Pale blue solution
- Pale pink solution
- Pale green solution
Correct

Incorrect
Question 27 of 48

27. Question
What colour is a solution containing Mn $^{2+}$ ions?
- Pale pink solution
- Pale blue solution
- Yellow solution
- Pale green solution
Correct

Incorrect
Question 28 of 48

28. Question
What colour is a solution containing Cr $^{3+}$ ions?
- Green solution
- Pale blue solution
- Yellow solution
- Pale pink solution
Correct

Incorrect
Question 29 of 48

29. Question
What is the definition of qualitative tests?
- Tests that tell you which ions are present within a compound
- Tests that tell you how much of an ion is present within a compound
- Tests that describe the type of atoms within a compound
- Tests that find the amount of each atom within a compound
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Question 30 of 48

30. Question
How do you test for a carbonate ion?
- Add a dilute strong acid and pass the gas released through limewater. The limewater with turn cloudy if a carbonate ion is present.
- Add sodium hydroxide and a coloured precipitate will form.
- Add aqueous silver nitrate and a coloured precipitate will form.
- Add dilute hydrochloric acid and barium chloride and a white precipitate of barium carbonate will form.
Correct

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Question 31 of 48

31. Question
What observation should be seen when testing for a carbonate ion?
- Limewater turns cloudy
- A white precipitate
- Coloured silver precipitate
- Red litmus paper turns blue
Correct

Incorrect
Question 32 of 48

32. Question
How do you test for a sulfate ion?
- Add dilute hydrochloric acid and barium chloride and a white precipitate of barium carbonate will form.
- Add sodium hydroxide and a coloured precipitate will form.
- Add aqueous silver nitrate and a coloured precipitate will form.
- Add a dilute strong acid and pass the gas released through limewater. The limewater with turn cloudy if a carbonate ion is present.
Correct

Incorrect
Question 33 of 48

33. Question
What observation should be seen when testing for a sulfate ion?
- A white precipitate
- Limewater turns cloudy
- Coloured silver precipitate
- Red litmus paper turns blue
Correct

Incorrect
Question 34 of 48

34. Question
How do you test for a halide ion?
- Add aqueous silver nitrate and a coloured precipitate will form.
- Add sodium hydroxide and a coloured precipitate will form.
- Add dilute hydrochloric acid and barium chloride and a white precipitate of barium carbonate will form.
- Add a dilute strong acid and pass the gas released through limewater. The limewater with turn cloudy if a carbonate ion is present.
Correct

Incorrect
Question 35 of 48

35. Question
What observation should be seen when testing for a halide ion?
- Coloured silver precipitate
- Limewater turns cloudy
- A white precipitate
- Red litmus paper turns blue
Correct

Incorrect
Question 36 of 48

36. Question
What coloured silver precipitate would form when testing for a chloride ion?
- White precipitate
- Cream precipitate
- Yellow precipitate
- Pale green precipitate
Correct

Incorrect
Question 37 of 48

37. Question
What coloured silver precipitate would form when testing for a bromide ion?
- Cream precipitate
- White precipitate
- Yellow precipitate
- Pale green precipitate
Correct

Incorrect
Question 38 of 48

38. Question
What coloured silver precipitate would form when testing for an iodide ion?
- Yellow precipitate
- White precipitate
- Cream precipitate
- Pale green precipitate
Correct

Incorrect
Question 39 of 48

39. Question
Write the ionic equation for the reaction between chlorine and silver nitrate.
- $Ag^+(aq) + Cl^-(aq)-> AgCl(s)$
- $Ag^+(aq) + Cl_2(aq)-> AgCl(s)$
- Ag(aq) + Cl(aq)-> AgCl(s)
- $Ag^+(aq) + Cl^-(aq)-> Ag(s)$
Correct

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Question 40 of 48

40. Question
Write the ionic equation for the reaction between bromine and silver nitrate.
- $Ag^+(aq) + Br^-(aq)-> AgBr(s)$
- $Ag^+(aq) + Br_2(aq)-> AgBr(s)$
- Ag(aq) + Br(aq)-> AgBr(s)
- $Ag^+(aq) + Br^-(aq)-> Ag(s)$
Correct

Incorrect
Question 41 of 48

41. Question
Write the ionic equation for the reaction between iodine and silver nitrate.
- $Ag^+(aq) + I^-(aq)-> AgI(s)$
- $Ag^+(aq) + I_2(aq)-> AgI(s)$
- Ag(aq) + I(aq)-> AgI(s)
- $Ag^+(aq) + I^-(aq)-> Ag(s)$
Correct

Incorrect
Question 42 of 48

42. Question
Write the formula for a chloride ion.
- Cl $^-$
- Cl
- Cl $^{2-}$
- Cl $^+$
Correct

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Question 43 of 48

43. Question
Write the formula for a bromide ion.
- Br $^-$
- Br
- Br $^{2-}$
- Br $^+$
Correct

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Question 44 of 48

44. Question
Write the formula for an iodide ion.
- I $^-$
- I
- I $^{2-}$
- I $^+$
Correct

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Question 45 of 48

45. Question
Describe the solubility of silver chloride in ammonia.
- Soluble in dilute ammonia
- Soluble in concentrated ammonia
- Insoluble in dilute and concentrated ammonia
- Soluble in dilute and concentrated ammonia
Correct

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Question 46 of 48

46. Question
Describe the solubility of silver bromide in ammonia.
- Soluble in concentrated ammonia
- Soluble in dilute ammonia
- Insoluble in dilute and concentrated ammonia
- Soluble in dilute and concentrated ammonia
Correct

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Question 47 of 48

47. Question
Describe the solubility of silver iodide in ammonia.
- Insoluble in dilute and concentrated ammonia
- Soluble in dilute ammonia
- Soluble in concentrated ammonia
- Soluble in dilute and concentrated ammonia
Correct

Incorrect
Question 48 of 48

48. Question
How do you test for an ammonium ion?
- Add dilute sodium hydroxide and heat. The gas produced will turn red litmus paper blue.
- Add aqueous silver nitrate and a coloured precipitate will form.
- Add sodium hydroxide and a coloured precipitate will form.
- Add dilute hydrochloric acid and barium chloride and a white precipitate of barium carbonate will form.
Correct

Incorrect