Explanation

(a)
Hypophosphorous acid is a monobasic acid as it forms one type of salts e.g. sodium hydrogen phophite (NaH_{2}PO_{2})
NaOH+ H_{3}PO_{2}⟶NaH_{2}PO_{2}+H_{2}O
Hydrophosphorus acid has two hydrogen atoms attached to phosphorus and one hydrogen atom attached to oxygen atom(which is ionisable), i.e.,
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