Question

$PCl_{3}$ and cold water reacts to produce which of the following?

• A. $H_3PO_3$
• B. $H_{3}PO_{2}$
• C. $H_4P_2O_7$
• D. $H_3PO_4$

Answer 1

Answer: (A)

$H_3PO_3$

Answer 2

$PCl _{3}$ and cold water reacts to produce orthophosphorous acid (phosphorous acid) $H _{3} PO _{3}$ $PCl _{3}+3 HOH \longrightarrow H _{3} PO _{3}+3 HCl$