Reactions of halide ions Quiz
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5 questions, one answer each
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1. What is observed when solid sodium iodide reacts with concentrated sulfuric acid?
- A. Only steamy white fumes
- B. Orange fumes only
- C. Black solid or purple vapour, a yellow solid and a bad egg smell
- D. No change
2. What is the colour of the precipitate with silver nitrate for bromide ions?
- A. White
- B. Cream
- C. Yellow
- D. Black
3. Which silver halide dissolves in dilute ammonia solution?
- A. AgCl
- B. AgBr
- C. AgI
- D. All of them
4. Why is nitric acid added before silver nitrate?
- A. To increase the rate of precipitation
- B. To remove carbonate ions that would give a false positive
- C. To dissolve silver halides
- D. To oxidise the halide ions
5. Which change in sulfur oxidation state is produced by the reaction with iodide to form H₂S?
- A. +6 to +4
- B. +6 to 0
- C. +4 to 0
- D. +6 to −2