Chemistry 9701 · AS & A Level · Electrochemistry

Electrochemistry — practice question

Reaction 1: chlorine is added to cold aqueous sodium hydroxide to give solution Z. Reaction 2: solution Z is heated and produces $\text{ClO}_3^-(aq)$ and $\text{Cl}^-(aq)$. Which equations match reaction 1 and reaction 2?

  • AReaction 1: $2\text{Cl}_2 + 4\text{OH}^- \rightarrow \text{ClO}_2^- + 3\text{Cl}^- + 2\text{H}_2\text{O}$; Reaction 2: $3\text{ClO}_2^- \rightarrow 2\text{ClO}_3^- + \text{Cl}^-$
  • BReaction 1: $2\text{Cl}_2 + 4\text{OH}^- \rightarrow \text{ClO}^- + 3\text{Cl}^- + 2\text{H}_2\text{O}$; Reaction 2: $3\text{ClO}^- \rightarrow \text{ClO}_3^- + 2\text{Cl}^-$
  • CReaction 1: $\text{Cl}_2 + 2\text{OH}^- \rightarrow \text{ClO}^- + \text{Cl}^- + \text{H}_2\text{O}$; Reaction 2: $2\text{ClO}^- + 2\text{OH}^- \rightarrow \text{ClO}_3^- + \text{Cl}^- + \text{H}_2\text{O}$
  • DReaction 1: $\text{Cl}_2 + 2\text{OH}^- \rightarrow \text{ClO}^- + \text{Cl}^- + \text{H}_2\text{O}$; Reaction 2: $3\text{ClO}^- \rightarrow \text{ClO}_3^- + 2\text{Cl}^-$

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