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  4. The correct statement about orthoboric acid is

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Q. The correct statement about orthoboric acid is

NTA AbhyasNTA Abhyas 2020The p-Block Elements - Part2

Solution:

Orthoboric acid is a weak mono basic acid with Ka=1.0 x 10-9. It does not act as protonic acid (i.e. proton donor) but behaves as Lewis acid by accepting a pair of electrons from OH- ion.

$\mathrm{B}(\mathrm{OH})_3+2 \mathrm{H}-\mathrm{O}-\mathrm{H} \rightarrow\left[\mathrm{B}(\mathrm{OH})_4\right]^{-}+\mathrm{H}_3 \mathrm{O}^{+}$