CAIE A Level Chemistry 9701 · Group 17
Describe the relative reactivity of the chloride, bromide and iodide ions as reducing agents. Explain how this trend is demonstrated by the reactions of aqueous solutions of sodium chloride, sodium bromide and sodium iodide with:
(i) aqueous silver nitrate followed by aqueous ammonia
(ii) concentrated sulfuric acid.
Include balanced chemical equations for the reactions with concentrated sulfuric acid.
7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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