MONOBASIC and WEAK Lewis ACID. Monobasic and weak Bronsted acid. Monobasic and strong Lewis acid. Tribasic and weak Bronsted acid.
Solution :B in `H_(3)BO_(3)` is electron deficient and therefore, it is a Lewis acid. It ACCEPTS a `OH^(-)` ion from water liberating a proton. Therefore, it behaves as a monobasic acid.