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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pb052

Select the correct statement(s) about orthoboric acid.

AIt acts as a Lewis acid by accepting a hydroxide ion.
BIt is a monobasic acid.
CIt ionises by releasing a proton from one of its own $O - H$ bonds.
DIn the solid state it has a layered structure with hydrogen bonding.

Answer: A, B, D

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

: the acid accepts

OH X^{-}

(Lewis acid) and only one

H X^{+}

is released per molecule, so A and B are true. The proton comes from water, not from the

O - H

of the acid, so C is false. The solid has hydrogen-bonded planar layers, so D is true.

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