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Addition of Cl(2) turns it colourless. W...

Addition of `Cl_(2)` turns it colourless. Why?

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`Cl_(2)` is a stronger oxidising agent than `I_(2)` and hence oxidises `I^(Theta)` to `I_(2)` initialy, which imparts a brown colour to the solution.
`Cl_(2)+2KI to 2KCl+underset(("Colourless"))(2HIO_(3))`.
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