10 minutes maximum! |
Søren Wedel Nielsen | CC-BY-SA 3.0 |
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1. Select the row showing the correct flame colours for the following ions: |
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Flame colour of metal ions |
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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 |
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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
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3. Chloride, bromide, and iodide ions in solution can be tested for by adding …
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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.
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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 |
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She correctly concluded that solid P was ….
- A. iron(II)chloride.
- B. iron(II)sulfate.
- C. iron(III)chloride.
- D. iron(III)sulfate.
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| 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.
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| 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……. |
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Observation |
Name of substance |
| A |
White precipitate |
Barium sulfate |
| B |
White precipitate |
Lithium chloride |
| C |
Cream precipitate |
Barium sulfate |
| D |
Cream precipitate |
Lithium chloride |
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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 |
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- A. lithium carbonate
- B. potassium carbonate
- C. lithium sulfate
- D. potassium sulfate
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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 |
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The negative ion present could be …..
- A. sulfate ion
- B. carbonate ion
- C. nitrate ion
- D. bromide ion
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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 |
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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
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10. Identify the negative ion contaminating the sodium sulfate solution.
- A. sulfate ion
- B. chloride ion
- C. bromide ion
- D. iodide ion
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