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Give reason for the following within two...

Give reason for the following within two sentences:
i. Hydrogen bromide cannot be prepared by the action of concentrated sulphuric acid on sodium bromide.
ii. When a blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red then gets decolourised.

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When a blue litmus is dipped into a solution of hypochlorous acid, It turns red and then gets decolourised. Explain.

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