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 on one type of salts e.g., sodium hydrogen phosphite \[(Na{{H}_{2}}P{{O}_{2}})\] \[NaOH+{{H}_{3}}P{{O}_{2}}\xrightarrow{{}}Na{{H}_{2}}P{{O}_{2}}+{{H}_{2}}O\] Hypophosphorus acid has two hydrogen atoms attached phosphorus and one hydrogen atom attached to oxygen atom (which is ionisable), i.e., \[H-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{P}}\,}}\,-OH\]
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