Redox Quiz
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5 questions, one answer each
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1. What is oxidation in terms of electrons?
- A. Gain of electrons
- B. Loss of electrons
- C. Gain of protons
- D. Loss of protons
2. What does OIL RIG stand for?
- A. Oxidation Is Loss, Reduction Is Gain
- B. Oxygen Is Lost, Reduction Is Given
- C. Oxidation Includes Loss, Reduction Includes Gas
- D. Oxide Is Lost, Reactant Is Gained
3. In the reaction Zn + CuSO₄ → ZnSO₄ + Cu, which statement is correct?
- A. Zinc is reduced, copper is oxidised
- B. Zinc is oxidised, copper ions are reduced
- C. Neither species changes oxidation state
- D. Both species are oxidised
4. Why is a reaction called a 'redox' reaction?
- A. Because it releases oxygen only
- B. Because reduction and oxidation happen at the same time
- C. Because it only involves reduction
- D. Because no electrons are transferred
5. During electrolysis of molten lead bromide, Pb²⁺ + 2e⁻ → Pb occurs at the cathode. Which statement correctly classifies this half-equation?
- A. Oxidation, because oxygen is lost
- B. Reduction, because electrons are gained
- C. Oxidation, because electrons are gained
- D. Reduction, because electrons are lost