Oxidation and reduction Quiz
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5 questions, one answer each
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1. In the reaction 2Mg + O₂ → 2MgO, which substance is oxidised?
- A. Oxygen
- B. Magnesium oxide
- C. Magnesium
- D. None of them
2. Which half-equation shows reduction?
- A. Zn → Zn²⁺ + 2e⁻
- B. Na → Na⁺ + e⁻
- C. Fe → Fe³⁺ + 3e⁻
- D. Cu²⁺ + 2e⁻ → Cu
3. In Zn + CuSO₄ → ZnSO₄ + Cu, which is the reducing agent?
- A. Zinc
- B. Copper(II) ions
- C. Copper
- D. Sulfate ions
4. What is oxidation in terms of electrons?
- A. Gain of protons
- B. Loss of electrons
- C. Gain of electrons
- D. Loss of protons
5. Which of these is NOT a redox reaction?
- A. Hydrochloric acid neutralising sodium hydroxide
- B. Burning methane in oxygen
- C. Iron rusting
- D. Zinc displacing copper from copper(II) sulfate solution