CAIE A Level Chemistry 9701 · Group 17
A student adds aqueous chlorine to separate solutions containing iodide ions and bromide ions. In a second experiment, aqueous iodine is added to a solution containing bromide ions. Suggest what is observed in each experiment and explain your reasoning in terms of the relative oxidising ability of the halogens.
4 marks, so the mark scheme is looking for about 4 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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