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  4. In the reaction B(OH)3 + 2H2O → [B(OH4)-] +H3O+ B(OH)3 functions as

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Q. In the reaction $B\left(OH\right)_{3} + 2H_{2}O \to [B\left(OH_{4}\right)^{-}] +H_{3}O^{+} \, B\left(OH\right)_{3}$ functions as

KCETKCET 2019The p-Block Elements

Solution:

Boric acid is a weak mono basic acid (not a protonic acid) but acts as a Lewis acid by accepting electrons from $OH^{-}$ ions.