Tests for anions and ammonium ions Quiz
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5 questions, one answer each
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1. Which reagent should be used to acidify a solution before testing for sulfate ions?
- A. Dilute sulfuric acid
- B. Dilute hydrochloric acid
- C. Aqueous ammonia
- D. Dilute ethanoic acid
2. What is observed when ammonia is tested with damp red litmus paper?
- A. It stays red
- B. It turns blue
- C. It bleaches
- D. It turns yellow
3. What is the formula of the white precipitate in the sulfate test?
- A. BaCO₃
- B. BaCl₂
- C. Ba(OH)₂
- D. BaSO₄
4. Which ionic equation shows the reaction of ammonium ions with hydroxide ions?
- A. NH₄⁺ + OH⁻ → NH₃ + H₂O
- B. NH₃ + OH⁻ → NH₄⁺ + H₂O
- C. NH₄⁺ + H⁺ → NH₃
- D. NH₄⁺ + Cl⁻ → NH₄Cl
5. A solution gives effervescence with dilute acid. The gas turns limewater milky. Which ion could be present?
- A. Sulfate
- B. Ammonium
- C. Chloride
- D. Hydrogencarbonate