Question

Identify the correct statement(s) about orthoboric acid.

• A. It has a layer structure in which planar $B{O}_3$ units are joined by hydrogen bonds.
• B. Orthoboric acid ($H_{3}B{O}_3$) is a weak monobasic Lewis acid.
• C. On heating ortho-boric acid form meta-boric acid and on further heating to red hot,forms boric oxide anhdride.
• D. None of the above

Answer 1

Answer: (A), (B), (C)

The correct options are
A Orthoboric acid ($H_{3}B{O}_3$) is a weak monobasic Lewis acid.
B It has a layer structure in which planar $B{O}_3$ units are joined by hydrogen bonds.
C On heating ortho-boric acid form meta-boric acid and on further heating to red hot,forms boric oxide anhdride.

When orthoboric acid is heated above ${170}^o$ C, it dehydrates and forms metaboric acid.
$H_{3}B{O}_3$ is a weak inorganic monobasic acid.