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Q.
$PCl_{3}$ and cold water reacts to produce which of the following?
Rajasthan PMTRajasthan PMT 2005
Solution:
$PCl _{3}$ and cold water reacts to produce orthophosphorous acid (phosphorous acid) $H_{3} PO _{3}$
$PCl _{3}+2 H OH \longrightarrow H _{3} PO _{3}+3 HCl$