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
Correct Answer: A
Solution :
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
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