Which of the following statements are true for H₃BO₃?

• A

  It is weak 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 a layer structure in which BO₃ units are joined by van der Waals forces of attraction.

• D

  It is obtained by treating borax with relatively conc. H₂SO₄.