Which of the following statements are true for `H_(3)BO_(3)` ?

Options

A. It is mainly monobasic acid and a Lewis acid
B. It does not act as a proton donor but acts as an acid by accepting hydroxyl ions
C. It has layer struture in which `BO_3` units are joined by hydrogen bonds
D. It is obtained by treating borax with conc. `H_2SO_4`

Answer

A, B, C, D

Explanation

`B (OH)_(3)+H_(2)O rarr [B(OH)_(4)]^(-) + H^(+)`
`H_3 BO_3` has layered structure with `BO_3` units are joined by hydrogen bonds
`Na_(2) B_(4)O_(7) + H_(2)SO_(4) + 5H_(2)O rarr Na_(2) SO_(4) + 4H_(3) BO_3`