A) mono basic acid and weak Lewis acid
B) mono basic and weak Bronsted acid
C) mono basic and strong Lewis acid
D) tri basic and weak Bronsted acid
Correct Answer: A
Solution :
Orthoboric acid, \[{{H}_{3}}B{{O}_{3}}\]is a weak monobasic acid 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 HP molecule . towards boron (due to very small size and high charge density of boron). Therefore, \[{{H}_{3}}B{{O}_{3}}\] due to the acceptance of electrons is a weak Lewis acid.
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