10 minutes maximum!

 flame test image
Søren Wedel Nielsen | CC-BY-SA 3.0

 

1. Select the row showing the correct flame colours for the following ions:
  Flame colour of metal ions
  Li+ Na+ K+ Cu2+
A red /crimson yellow orange- red blue -green
B blue -green orange-red lilac red /crimson
C lilac orange-red blue-green red /crimson
D red /crimson yellow lilac blue -green
2. Unknown substance Z fizzed when acid was added producing a gas which turned limewater milky. The ion confirmed as being present in Z was:
  • A.   sulphate
  • B.   nitrate
  • C.   carbonate
  • D.   carbon dioxide

 

 

 

3. Chloride, bromide, and iodide ions in solution can be tested for by adding ...


 Precipitates
Cychr | CC-BY-SA 3.0
  • A. dilute nitric acid followed by silver nitrate solution.
  • B. dilute nitric acid followed by barium chloride solution.
  • C. dilute hydrochloric acid followed by silver nitrate solution.
  • D. dilute hydrochloric acid followed by barium chloride solution.

4. A student was given an unknown solid, P, to identify. She dissolved a small sample of the solid in water and tested as follows:

Test Result
Add sodium hydroxide solution Brown precipitate forms
Add hydrochloric acid then barium chloride solution White precipitate forms
 

She correctly concluded that solid P was ...

  • A.   iron(II)chloride.
  • B.   iron(II)sulfate.
  • C.   iron(III)chloride.
  • D.   iron(III)sulfate.
5. Substance X produced a yellow precipitate when added to silver nitrate solution.

This yellow precipitate is ...

  • A.   silver bromide.
  • B.   silver iodide.
  • C.   barium nitrate.
  • D.   lead(II)nitrate.
6. A student made a sample of lithium sulfate solution.  She tested her solution by adding a few drops of acidified barium chloride solution to it.

The observation she made and the name of the substance responsible for this observation is ...

  
  Observation Name of substance
A White precipitate Barium sulfate
B White precipitate Lithium chloride
C Cream precipitate Barium sulfate
D Cream precipitate Lithium chloride

7. Identify the white solid which gave the following results when tested:

Test Result
Flame test Lilac flame
Add hydrochloric acid followed by barium chloride solution Bubbles produced, no precipitate formed
 
  • A.   lithium carbonate
  • B.   potassium carbonate
  • C.   lithium sulfate
  • D.   potassium sulfate

8. A solution was tested as follows to identify the negative ion present:

Test Result
Add dilute hydrochloric acid No effervescence
Add acidified silver nitrate No precipitate formed
Add acidified barium chloride No precipitate formed
 

The negative ion present could be ...

  • A. sulfate ion
  • B. carbonate ion
  • C. nitrate ion
  • D. bromide ion

9-10. A teacher suspected that a sodium sulfate solution had been contaminated.
She tested the solution and obtained the following results:

Test Result
Flame test Yellow flame
Add sodium hydroxide solution Green precipitate formed
Add acidified silver nitrate solution White precipitate formed
Add acidified barium chloride solution  White precipitate formed
flame test image
Søren Wedel Nielsen | CC-BY-SA 3.0
9. Identify the positive ion contaminating the sodium sulfate solution.
  • A.   copper(II) ion
  • B.   iron(III) ion
  • C.   iron(II) ion
  • D.   sodium ion

10. Identify the negative ion contaminating the sodium sulfate solution.

  • A.   sulfate ion
  • B.   chloride ion
  • C.   bromide ion
  • D.   iodide ion