Q56 / 180 · NEET 2016 (Phase 2) · Chemistry

Boric acid is an acid because its molecule

A
contains replaceable $H^{+}$ ion.
B
gives up a proton.
Correct answer
C
accepts ${OH}^{-}$ from water releasing proton.
D
combines with proton from water molecule.

Solution

Boric acid is an acid because its molecule accepts

{OH}^{(-)}

from water releasing proton. It acts as a Lewis acid because of the electron deficient nature of boron in boric acid.

B {(OH)}_{3} + H_{2} O \to {[B {(OH)}_{4}]}^{(-)} (aq) + H^{(+)} (aq)

Hence, the correct answer is option: 'C'.

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