The correct statement about orthoboric acid is

Question

The correct statement about orthoboric acid is (A) It is a strong monobasic acid (B) It is not a proton donor, but a weak Lewis acid (C) It is a tribasic acid (D) It is harmful for eyes

Tardigrade Admin · Accepted Answer

Orthoboric acid is a weak mono basic acid with K_a=1.0 x 10^-9. It does not act as protonic acid (i.e. proton donor) but behaves as Lewis acid by accepting a pair of electrons from OH^- ion.

B (OH)_{3} + 2 H - O - H \to [B (OH)_{4}]^{-} + H_{3} O^{+}

Q. The correct statement about orthoboric acid is

It is a strong monobasic acid

It is not a proton donor, but a weak Lewis acid

It is a tribasic acid

It is harmful for eyes

Orthoboric acid is a weak mono basic acid with Ka=1.0 x 10-9. It does not act as protonic acid (i.e. proton donor) but behaves as Lewis acid by accepting a pair of electrons from OH- ion. B(OH)3​+2H−O−H→[B(OH)4​]−+H3​O+

Orthoboric acid is a weak mono basic acid with K_a=1.0 x 10^-9. It does not act as protonic acid (i.e. proton donor) but behaves as Lewis acid by accepting a pair of electrons from OH^- ion.

$B (OH)_{3} + 2 H - O - H \to [B (OH)_{4}]^{-} + H_{3} O^{+}$