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  4. Phosphorus reacts with chlorine gas to give a colourless liquid, which fumes in moist air to produce HCl and

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Q. Phosphorus reacts with chlorine gas to give a colourless liquid, which fumes in moist air to produce $HCl$ and

KVPYKVPY 2017The p-Block Elements

Solution:

Phosphorus reacts with chlorine gas to give phosphorus trichloride, $PCl_{3}$ which is a colourless liquid. Fumes of $PCl_{3}$ in moist air produces $HCl$ and phosphorous acid, $H_{3}PO_{3}$.
$P_{4}+Cl_{2} \rightarrow \underset{\text{Colourless liquid}}{PCl_{3}} \xrightarrow[\text{Moisture}]{H_2O} H_{3} PO_{3} +HCl$