Question

Which of the following oxoacids of phosphorous is a reducing agent and a monobasic acid as well

• A. $H_4{P}_2{O}_5$
• B. $HP{O}_3$
• C. $H_{3}P{O}_3$
• D. $H_{3}P{O}_2$

Answer 1

The correct option is D $H_{3}P{O}_2$

Acids which contain P-H bonds have strong reducing properties. Hypophosphorous acid $\left(H_{3}P{O}_2\right)$ is a good reducing agent as it contains two P - H bonds. It has one P - OH bond, so it is monobasic.