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When moist blue litmus paper is dipped i...

When moist blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red and then it gets decolorised. Explain.

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HOCl acts as an acid `HOCl to H^(+)+Ocl^(-)` and hence, turns blue litmus red. It also acts as a bleaching agent because it dissociates to given ascent oxygen `(HOCl to HCl + O)`, which decolorises the red litmus by oxidation.
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