Which of the following oxoacids of phosphorous is a reducing agent and a monobasic acid?
HPO3
H3PO3
H3PO2
H4P2O5
Solution:
Acids which contain P-H bonds have strong reducing properties. Hypophosphorous acid (H3PO2) is a good reducing agent as it contains two P - H bonds. It has one P - OH bond, so it is monobasic.