1. Oxygen and carbon dioxide can both be tested for in the lab.

     Select the most appropriate test for each gas from the table below:

  Oxygen Carbon dioxide
A ‘Pops’ with a lit splint Puts out a lit splint
B ‘Pops’ with a lit splint Turns limewater milky
C Relights a glowing splint Turns limewater milky
D Relights a glowing splint Puts out a lit splint
2. Fireworks have coloured flames due to the presence of metal ions.

Farmer using lime to neutralise soil

A blue-green flame is produced by the presence of ..

  • A.   calcium ions
  • B.   copper(II) ions
  • C.   potassium ions
  • D.   lithium ions
3. A student tested a solution for the presence of iodide ions. The test was positive.

The solutions the student added and the observation made were..

  Substances added Observation made
A Nitric acid and silver nitrate White precipitate
B Nitric acid and silver nitrate  Yellow precipitate
C Hydrochloric acid and silver nitrate White precipitate
D Hydrochloric acid and silver nitrate Yellow precipitate

4. A white solid X was tested and gave the following results:

Test Result
Flame test orange-red flame
Dilute hydrochloric acid added Bubbles seen

The name of solid X is..

  • A.   calcium sulfate
  • B.   calcium carbonate
  • C.   lithium sulfate
  • D.   lithium carbonate

5. Which is the correct test for ammonium ions?

  Warm the sample gently with .. Test any gas evolved with..
A Sodium hydroxide solution Damp blue litmus paper
B Sodium hydroxide solution Damp red litmus paper
C Dilute hydrochloric acid Damp blue litmus paper
D Dilute hydrochloric acid Damp red litmus paper

A yellow solution Y was tested and gave the following results:

Test Result
Add sodium hydroxide solution brown precipitate
Add dilute hydrochloric acid then barium chloride solution white precipitate
6. The name of the brown precipitate formed is..
  • A.   iron(II)hydroxide
  • B.   iron(III)hydroxide
  • C.   iron(II)sulfate
  • D.   iron(III)sulfate
7. The formula of the white precipitate formed is..
  • A.   FeCl2
  • B.   BaCO3
  • C.   BaSO4
  • D.   BaCl2

8. What solid is used to test for the presence of water and what colour change would be observed if water was present?

  Solid Result
A anhydrous copper(II)sulfate Blue to white
B anhydrous copper(II)sulfate white to blue
C anhydrous copper(II)carbonate Blue to white
D anhydrous copper(II)carbonate White to blue

9. A student is given an unknown solution. Which two of the following tests would provide evidence that the solution is copper(II)sulfate?

1. Adding hydrochloric acid
2. Adding sodium hydroxide solution
3. Adding dilute nitric acid then silver nitrate
4. Adding dilute hydrochloric acid then barium chloride
  • A.   1 and 3
  • B.   1 and 4
  • C.   2 and 3
  • D.   2 and 4
10. Ammonia gas is produced when a mixture of ammonium chloride and substance X is heated. What is substance X?
  • A.   silver nitrate
  • B.   sodium hydroxide
  • C.   barium chloride
  • D.   hydrochloric acid