Question

Which of the following oxy-acid is good reducing agent ?

• A. $H_{3}P{O}_2$
• B. $H_{3}P{O}_3$
• C. $H_{3}P{O}_4$
• D. $H_4{P}_2{O}_7$

Answer 1

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

Solution:- (A) $H_{3}P{O}_2$

A reducing agent must be oxidized itself. Since the oxidation state of $P$ in $H_{3}P{O}_2$ is lowest, i.e., $+1$, thus is a good reducing agent.