Assertion :Chlorine water must be stored in dark colored bottles. Reason: Hypochlorous acid on exposure to sunlight decomposes to $H_{2}$ and ${C l}_{2}$ gas.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Chlorine water is stored in dark coloured bottles to protect it from sunlight. If exposed to sunlight, it forms hypochlorous acid.
$C l_{2} + H_{2} O \to H C l + H C l O$

Upon further decomposition in the presence of sunlight, hypochlorous acid gives hydrochloric acid and oxygen.
$2 H C l O \to 2 H C l + O_{2}$

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