Chemistry 9701 · AS & A Level · Electrochemistry

Electrochemistry — practice question

Reaction 1: chlorine is reacted with cold aqueous sodium hydroxide, producing solution Z. Reaction 2: solution Z is heated, and $ \text{ClO}_3^- (aq) $ and $ \text{Cl}^- (aq) $ are formed. Which equations show reaction 1 and reaction 2?

  • Areaction 1: $2\text{Cl}_2 + 4\text{OH}^- \rightarrow 2\text{ClO}_2^- + 3\text{Cl}^- + 2\text{H}_2\text{O}$; reaction 2: $3\text{ClO}_2^- \rightarrow 2\text{ClO}_3^- + \text{Cl}^-$
  • Breaction 1: $2\text{Cl}_2 + 4\text{OH}^- \rightarrow 2\text{ClO}^- + 3\text{Cl}^- + 2\text{H}_2\text{O}$; 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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