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Give the reason for bleaching action of ...

Give the reason for bleaching action of `Cl_2`.

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`Cl_2` in presence of moisture produces nascent hydrogen which is responsible for bleaching property.
`Cl_(2) + H_(2)O to underset(HCl + [O])(HOCl) + HCl`
Coloured matter `+ [O] to` Colourless
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