`H_(3)BO_(3)` is :

Options

A. monobasic and weak Lewis acid
B. monobasic and weak Bronsted acid
C. monobasic and strong Lewis acid
D. tribasic and weak Bronsted acid.

Answer

A

Explanation

`H_(3)BO_(3)` in watter gives `H^(+)` ions as follows
`H_(3)BO_(3)+H_(2)O rarr [B(OH)_(4)]^(-)+H^(+)`
It is monobasic as one molecule of the acid gives one `H^(+)` ion. As `H_(3)BO_(3)` or `B(OH)_(3)` takes up a pair of electrons from `OH^(-)` , it is a Lewis acid.