Chemistry 9701 · AS & A Level · Electrochemistry

Electrochemistry — practice question

When chlorine is heated with aqueous sodium hydroxide, the overall reaction is as follows. $3\text{Cl}_2(aq) + 6\text{NaOH}(aq) \rightarrow 5\text{NaCl}(aq) + \text{NaClO}_3(aq) + 3\text{H}_2\text{O}(l)$ What oxidation numbers does chlorine have in each of the species below?

  • A$\text{Cl}_2 = 0$, NaCl = $+1$, $\text{NaClO}_3 = -5$
  • B$\text{Cl}_2 = +2$, NaCl = $-1$, $\text{NaClO}_3 = +3$
  • C$\text{Cl}_2 = 0$, NaCl = $-1$, $\text{NaClO}_3 = +5$
  • D$\text{Cl}_2 = -2$, NaCl = $+1$, $\text{NaClO}_3 = -3$

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