Oxidation, reduction and disproportionation Quiz
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5 questions, one answer each
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1. In Cl₂ + 2Br⁻ → 2Cl⁻ + Br₂, which species is the reducing agent?
- A. Cl₂
- B. Br⁻
- C. Cl⁻
- D. Br₂
2. What is the change in oxidation number of Mg in 2Mg + O₂ → 2MgO?
- A. 0 to −2
- B. +2 to 0
- C. +1 to +2
- D. 0 to +2
3. Which reaction is a disproportionation?
- A. 2Na + Cl₂ → 2NaCl
- B. Cl₂ + 2Br⁻ → 2Cl⁻ + Br₂
- C. Cl₂ + 2NaOH → NaCl + NaClO + H₂O
- D. CaO + 2HCl → CaCl₂ + H₂O
4. Which statement about non-metals is correct?
- A. They form negative ions by electron gain, with a decrease in oxidation number
- B. They form positive ions by electron loss
- C. They are always reducing agents
- D. Their oxidation number always increases
5. In 3Cl₂ + 6NaOH → 5NaCl + NaClO₃ + 3H₂O, what is the highest oxidation number of chlorine?
- A. +1
- B. +3
- C. +5
- D. +7