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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 2022

Solution:

Orthoboric acid is a weak mono basic acid with $K _{ a }=1.0 \times 10^{-9}$. 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. $B ( OH )_3+2 H - O - H \rightarrow \left[ B OH _4\right]^{-}+ H _3 O ^{+}$