R3.2 Electron transfer reactions Quiz
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5 questions, one answer each
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1. E⦵(Cu²⁺/Cu) = +0.34 V and E⦵(Zn²⁺/Zn) = −0.76 V. What is E⦵cell for a zinc–copper cell?
- A. +0.42 V
- B. −0.42 V
- C. +1.10 V
- D. −1.10 V
2. A reaction has E⦵cell = +0.50 V and n = 2. What is ΔG⦵?
- A. −96.5 kJ mol⁻¹
- B. +96.5 kJ mol⁻¹
- C. −48.3 kJ mol⁻¹
- D. −193 kJ mol⁻¹
3. What forms at the cathode when aqueous copper(II) sulfate is electrolysed with graphite electrodes?
- A. Hydrogen
- B. Oxygen
- C. Copper
- D. Sulfur
4. Which is correct for electroplating a spoon with silver?
- A. The spoon is the anode
- B. The electrolyte contains Ag⁺ ions
- C. The spoon is oxidised
- D. Oxygen forms at the spoon
5. What is the oxidation state of chlorine in ClO₃⁻?
- A. −1
- B. +3
- C. +5
- D. +7