Chemistry 0620 · IGCSE · Electrolysis

Electrolysis — practice question

Concentrated aqueous sodium chloride is electrolysed with inert electrodes. Which equation represents the correct ionic half-equation for the reaction at the anode?

  • A$\text{Cl}^- + e^- \rightarrow \text{Cl}$
  • B$2\text{Cl}^- \rightarrow \text{Cl}_2 + 2e^-$
  • C$\text{H}^+ \rightarrow \text{H} + e^-$
  • D$2\text{H}^+ + 2e^- \rightarrow \text{H}_2$

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