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Why does "PCl"(3) fume in moisture ?...

Why does `"PCl"_(3)` fume in moisture ?

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`"PCl"_(3)` hydrolyses in the presence of moisture giving fumes of HCl.
`"PCl"_(3)+3"H"_(2)"O"to"H"_(3)"PO"_(3)+3"HCl"`
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