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  4. Hypo phosphorous acid, H3PO2 is:

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Q. Hypo phosphorous acid, $ {{H}_{3}}P{{O}_{2}} $ is:

BVP MedicalBVP Medical 2003

Solution:

Hypophosphorus acid is a monobasic acid as it forms only one type of salts e.g., sodium hydrogen phosphite $ (Na{{H}_{2}}P{{O}_{2}}) $ $ NaOH+{{H}_{3}}P{{O}_{2}}\xrightarrow{{}}Na{{H}_{2}}P{{O}_{2}}+{{H}_{2}}O $ Hypo phosphorous acid has 2-hydrogen atoms attached to phosphorus and one hydrogen atom attached to oxygen atom (which is ionisable). i.e., $ \overset{\text{O}}{\mathop{\overset{||}{\mathop{\underset{\text{H}}{\mathop{\underset{|}{\mathop{H-\text{P}-OH}}\,}}\,}}\,}}\, $