Oxidation & Reduction in Terms of Electrons 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 oxygen
- D. Loss of oxygen
2. What is reduction in terms of electrons?
- A. Gain of electrons
- B. Loss of electrons
- C. Loss of oxygen only
- D. Gain of protons
3. What name is given to a reaction in which oxidation and reduction occur simultaneously?
- A. Neutralisation
- B. Displacement only
- C. Redox reaction
- D. Combustion
4. In the half-equation Zn → Zn²⁺ + 2e⁻, what is happening to the zinc?
- A. It is being reduced, as it gains electrons
- B. It is being oxidised, as it loses electrons
- C. It is being neutralised
- D. Nothing, as no electrons are transferred
5. During the electrolysis of copper sulfate solution using inert electrodes, copper ions are deposited at the cathode. Using electron-transfer definitions, what is happening to the copper ions?
- A. They are oxidised, because they lose electrons at the cathode
- B. They are reduced, because they gain electrons at the cathode
- C. They are neither oxidised nor reduced, since no electrons are involved
- D. They are oxidised, because the cathode is positively charged