Reactions of metal ions with hydroxide, ammonia and carbonate Quiz
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5 questions, one answer each
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1. A solution gives a green precipitate with NaOH that turns brown on standing. The ion present is
- A. Fe²⁺
- B. Cu²⁺
- C. Fe³⁺
- D. Al³⁺
2. Which solution gives effervescence with sodium carbonate solution?
- A. Copper(II) sulfate
- B. Iron(II) sulfate
- C. Aluminium chloride
- D. None of them
3. What is the colour of the complex formed when excess ammonia is added to Cu²⁺(aq)?
- A. Pale blue
- B. Deep blue
- C. Green
- D. Colourless
4. Which hydroxide dissolves in excess sodium hydroxide solution?
- A. Cu(OH)₂(H₂O)₄
- B. Fe(OH)₂(H₂O)₄
- C. Fe(OH)₃(H₂O)₃
- D. Al(OH)₃(H₂O)₃
5. What is the role of ammonia when a small amount is added to [Cu(H₂O)₆]²⁺?
- A. Oxidising agent
- B. Catalyst
- C. Base
- D. Reducing agent