Uses of chlorine and chlorate(I) Quiz
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5 questions, one answer each
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1. In the reaction Cl₂ + H₂O ⇌ 2H⁺ + Cl⁻ + ClO⁻, what happens to chlorine?
- A. It is only oxidised
- B. It is only reduced
- C. It is both oxidised and reduced
- D. Its oxidation state does not change
2. Which species in chlorinated water kills bacteria?
- A. Cl⁻
- B. H⁺
- C. ClO⁻
- D. Cl₂ only as a gas
3. What forms when chlorine reacts with water in sunlight?
- A. Hydrogen and chlorate(I)
- B. Chloride ions and oxygen
- C. Chlorate(V) and hydrogen
- D. Hydrochloric acid only
4. Which is a risk of chlorinating water?
- A. It causes cholera
- B. It forms chlorinated hydrocarbons that may be carcinogenic
- C. It removes all minerals
- D. It raises the pH sharply
5. What are the products of chlorine with cold dilute aqueous sodium hydroxide?
- A. NaCl and NaClO and water
- B. NaClO₃ and NaCl only
- C. NaCl and H₂ and O₂
- D. NaOCl and HCl only