Redox Reactions Quiz
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5 questions, one answer each
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1. What is the definition of oxidation in terms of electrons?
- A. Gain of electrons
- B. Loss of electrons
- C. Gain of oxygen only
- D. Loss of protons
2. What does the mnemonic OIL RIG help you remember?
- A. The order of the reactivity series
- B. Oxidation Is Loss, Reduction Is Gain of electrons
- C. The colours of flame tests
- D. The stages of the Contact process
3. What is a redox reaction?
- A. A reaction that only involves oxidation
- B. A reaction where oxidation and reduction happen at the same time
- C. A reaction that produces only oxygen
- D. A reaction with no electron transfer
4. In the reaction Fe2O3 + 3CO → 2Fe + 3CO2, which substance is reduced?
- A. Carbon monoxide
- B. Iron oxide
- C. Carbon dioxide
- D. Iron
5. During electrolysis of molten lead bromide, lead forms at the cathode and bromine forms at the anode. Using the electron definition, explain what happens at the cathode.
- A. Br- ions lose electrons and are oxidised
- B. Pb2+ ions gain electrons and are reduced
- C. Pb2+ ions lose electrons and are oxidised
- D. Br- ions gain electrons and are reduced