Orthoboric acid in aqueous medium is

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(A) Orthoboric acid $(H_3BO_3)$ acts as a weak Lewis acid in aqueous medium. It accepts a lone pair of electrons from $OH^-$ ions of water to form the

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Monobasic

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(A) Orthoboric acid $(H_3BO_3)$ acts as a weak Lewis acid in aqueous medium. It accepts a lone pair of electrons from $OH^-$ ions of water to form the $[B(OH)_4]^-$ complex and releases a proton $(H^+)$. The reaction is: $H_3BO_3 + H_2O \rightleftharpoons [B(OH)_4]^- + H^+$. Since it releases only one $H^+$ ion per molecule,it is a monobasic acid.

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