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Q.
$ H_{3}BO_{3} $ is
Chhattisgarh PMTChhattisgarh PMT 2009
Solution:
Orthoboric acid, $H _{3} BO _{3}$ 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, $H _{2} BO _{3}$ due to the acceptance of electrons is a weak Lewis acid