Question

Describe an experiment which shows that chlorine is more relative than iodine. Include an equation in your answer.

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Answer 1

Halogen displacement reactions

A more reactive halogen can displace a less reactive halogen from solutions of its salts. For example, chlorine is more reactive than iodine. A solution of chlorine can displace iodine from potassium iodide solution:

chlorine + potassium iodide → potassium chloride + iodine

Cl2(aq) + 2KI(aq) → 2KCl(aq) + I2(aq)

The reaction mixture turns darker and iodine solution forms.

The slideshow shows what happens when solutions of chlorine, bromine and iodine are added to various potassium halide salts.

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