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MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Boron compounds: diborane, boric acid, borax, boron halides

NEET levelSingle correct optionDifficulty 1 of 3pb167

Boric acid, $H X_{3} BO X_{3}$ , in water behaves as

Aa weak tribasic Bronsted acid
Ba strong tribasic Bronsted acid
Ca weak monobasic Lewis acid
Da strong monobasic Lewis acid

Answer: C

Boron is electron deficient, so

B (OH) X_{3}

accepts

OH X^{-}

from water:

B (OH) X_{3} + H X_{2} O [B (OH) X_{4}] X^{-} + H X^{+}

. It releases only one

H X^{+}

this way and is weak, so it is a weak monobasic Lewis acid.

Practice p-Block Elements: Groups 13 and 14 More on Boron compounds: diborane, boric acid, borax, boron halides

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