Question

$H_{3}B{O}_3$ is

• A. mono basic add and weak Lewis add
• B. mono basic and weak Bronsted add
• C. mono basic and strong Lewis add
• D. tri basic and weak Bronsted acid

Answer 1

Answer: (A)

Orthoboric acid, $H_{3}B{O}_3$ is a weak monobasic ace. but its acidic character is not due to liberation of $H^{+}$ion from it. Its acidic character is due to pull off of electron from $H_{2}O$ molecule awards boron (due to very small size and high charge density of boron). Therefore, $H_{2}B{O}_3$ due to the acceptance of electrons is a weak Lewis acid