A) a monobasic acid
B) a tribasic acid
C) a dibasic acid
D) not acidic at all
Correct Answer: A
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.,\[\overset{\text{O}}{\mathop{\overset{||}{\mathop{\underset{\text{H}}{\mathop{\underset{|}{\mathop{H-\text{P}-OH}}\,}}\,}}\,}}\,\]
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