Oxidation states and redox Quiz
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5 questions, one answer each
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1. What is the oxidation state of sulfur in H₂SO₄?
- A. +4
- B. +6
- C. −2
- D. +2
2. In which compound does oxygen have an oxidation state of −1?
- A. H₂O
- B. Na₂O
- C. H₂O₂
- D. CO₂
3. In the reaction Mg + Cl₂ → MgCl₂, which statement is correct?
- A. Mg is reduced
- B. Cl₂ is the reducing agent
- C. Mg is oxidised and is the reducing agent
- D. Cl₂ is oxidised
4. What is the oxidation state of chromium in CrO₄²⁻?
- A. +3
- B. +4
- C. +7
- D. +6
5. A species is reduced. What must happen to its oxidation state?
- A. It decreases
- B. It increases
- C. It stays the same
- D. It becomes zero