Question
Why is boric acid $\left(\mathrm{H}_2 \mathrm{BO}_3\right)$ monobasic acid?

Answer

It accepts a pair of electrons from $\mathrm{OH}^{-}$ion of $\mathrm{H}_2 \mathrm{O}$ therefore, it is monobasic acid. $\mathrm{B}(\mathrm{OH}) \_3+\mathrm{H}_2 \mathrm{O} \longrightarrow\left[\mathrm{B}(\mathrm{OH})_4\right]^{-}+\mathrm{H}^{+}$

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