CAIE A Level Chemistry 9701 · Electrochemistry
Chlorine gas is bubbled into cold, dilute sodium hydroxide solution. The reaction produces sodium chloride, sodium chlorate(I) and water.
Suggest what this reaction shows about the oxidation numbers of chlorine and about the role of chlorine in the reaction. In your answer, identify the oxidation numbers of chlorine in each product and explain why the reaction is an example of disproportionation.
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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