Displacement reactions involving the halogens
3 marks · EasyName the most reactive halogen out of chlorine, bromine, and iodine.
Describe what happens when iodine solution is added to potassium bromide solution.
Explain your answer to part (b).
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(a) Chlorine
(b) No reaction occurs; no colour change.
(c) Iodine is less reactive than bromine and cannot displace it from potassium bromide.
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Marking points
B1 (a) · 1 mark · Names chlorine as the most reactive halogen.
B2 (b) · 1 mark · States no reaction or no colour change.
B3 (c) · 1 mark · Explains that iodine is less reactive and so cannot displace bromine.
Worked solution
a) Chlorine is the most reactive.
b) No reaction occurs; there is no colour change.
c) Iodine is less reactive than bromine and cannot displace bromine from its salt.