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Question:

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.