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A solution of potassium bromide is treated with each of the following. Which one would liberate bromine?

1. (a) Hydrogen iodide
2. (b) Sulphur dioxide
3. (c) Chlorine
4. (d) Iodine

Correct answer: (c) Chlorine

Solution

Chlorine is more reactive than bromine and can displace bromine from potassium bromide, liberating bromine gas. This is based on the reactivity trend in halogens.

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