Displacement reactions involving the halogens
2 marks · EasyExplain, using the reactivity trend, why chlorine can displace iodine from potassium iodide solution but iodine cannot displace chlorine from potassium chloride solution.
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Common mistakes: Mixing up order of reactivity; Saying both reactions occur
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Marking points
M1 · 1 mark · Chlorine is more reactive than iodine, so it displaces iodine from potassium iodide.
M2 · 1 mark · Iodine is less reactive than chlorine so cannot displace it from potassium chloride.
Worked solution
Chlorine is more reactive than iodine, so it displaces iodine from potassium iodide solution. Iodine is less reactive than chlorine, so it cannot displace chlorine from potassium chloride.