Question

Which of the following(s) is/are true about orthophosphorous acid?

• A. It is represented by $H_{3}P{O}_3$
• B. It has two $P-OH$ bonds
• C. It is prepared by hydrolysis of $P_2{O}_3$
• D. It has +4 oxidation state on central $P$ atom

Answer 1

Answer: (A), (B), (C)

It is prepared by hydrolysis of $P_2{O}_3$

Orthophosphorous acid $\left(H_{3}P{O}_3\right)$ is prepared by the hydrolysis of $P_2{O}_3$.
$P_2{O}_3+3H_{2}O\to 2H_{3}P{O}_3$

Structure of $H_{3}P{O}_3$:

The oxidation state of $P$ in $H_{3}P{O}_3$ is +3.