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Q.
Which of the following hydroxides is acidic?
The p-Block Elements
Solution:
$B(OH)_3$ orthoboric acid is acidic in nature and can accept $OH^+$ ions to release $H^+$ in solution.
$H_{3}BO_{3}+H_{2}O\to H_{3}O^{+}+H_{2}BO_{3}^{-}$