Group 7 trends and halogen reactions Quiz
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5 questions, one answer each
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1. Which halogen is a purple solution in hexane?
- A. Chlorine
- B. Bromine
- C. Iodine
- D. Fluorine
2. What is the oxidation number of chlorine in NaClO₃?
- A. +1
- B. −1
- C. +3
- D. +5
3. Which pair of reagents gives a displacement reaction?
- A. I₂(aq) and KCl(aq)
- B. Br₂(aq) and KCl(aq)
- C. I₂(aq) and KBr(aq)
- D. Cl₂(aq) and KBr(aq)
4. Why does the melting temperature of the halogens increase from Cl₂ to I₂?
- A. The covalent bond gets stronger
- B. The London forces between molecules get stronger
- C. The molecules become ionic
- D. Hydrogen bonds form
5. In the reaction of chlorine with cold dilute sodium hydroxide, chlorine is oxidised and reduced. What is the name of this?
- A. Neutralisation
- B. Hydrolysis
- C. Disproportionation
- D. Displacement