Question

The oxyacid of phosphorus that is reducing, dibasic and contains one $P-O-P$ bond is :

• A. $H_{3}P{O}_3$
• B. $H_4{P}_2{O}_7$
• C. $H_{3}P{O}_4$
• D. $H_4{P}_2{O}_5$

Answer 1

The correct option is D $H_4{P}_2{O}_5$

$H_{3}P{O}_3$ is reducing, dibasic and has no $P-O-P$ bond.

$H_4{P}_2{O}_7$ is tetrabasic, has one $P-O-P$ bond and is reducing.

$H_{3}P{O}_4$ has no $P-O-P$ bond, is tribasic and non-reducing.

$H_4{P}_2{O}_5$ is dibasic, has $P-O-P$ bond and is reducing.