Question

$H_3PO_2$ is the molecular formula of an acid of phosphorous. Its name and basicity respectively are

• A. phosphorous acid and 2
• B. hypophosphorous acid and 2
• C. hypophosphorous acid and one
• D. hypophosphoric acid and two

Answer 1

Answer: (C)

hypophosphorous acid and one

Answer 2

The name of $H_3PO_2$ is hypophosphorous acid
when dissolve in water, it gives only one $H^+$, so its
basicity is one.