Chemical Tests Quiz
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5 questions, one answer each
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1. What is the positive result for the test for hydrogen gas?
- A. The splint relights
- B. A squeaky pop
- C. The limewater turns milky
- D. A white precipitate forms
2. What flame colour is produced by potassium ions in a flame test?
- A. Yellow
- B. Red
- C. Lilac
- D. Orange-red
3. A white precipitate forms when sodium hydroxide solution is added to a colourless salt solution, which does not dissolve in excess NaOH. What cation could be present?
- A. Fe2+
- B. Cu2+
- C. Fe3+
- D. This does not match Cu2+, Fe2+ or Fe3+, which all give coloured precipitates
4. A student adds dilute nitric acid then silver nitrate solution to an unknown solution and observes a cream precipitate. Which ion is present?
- A. Chloride
- B. Bromide
- C. Iodide
- D. Sulfate
5. A liquid turns anhydrous copper(II) sulfate blue and boils at exactly 100°C. What can be concluded?
- A. The liquid contains water but is not pure
- B. The liquid is pure water
- C. The liquid contains no water
- D. The liquid is definitely an acid