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JEE Main levelSingle correct optionDifficulty 2 of 3ph094

Chlorine water is stored in a transparent bottle in strong sunlight for several days. The solution finally contains mainly

A $HClO X_{3}$ and $HCl$
B $HOCl$ only
C $HClO X_{4}$
Ddilute $HCl$ , with $O X_{2}$ liberated

Answer: D

Cl X_{2} + H X_{2} O HCl + HOCl

, and in light hypochlorous acid decomposes:

2 HOCl 2 HCl + O X_{2}

. Removal of HOCl drives the equilibrium until essentially all chlorine becomes HCl.

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