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NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice

The correct statement about orthoboric acid is

Options

  1. AIt is a strong monobasic acid
  2. BIt is not a proton donor, but a weak Lewis acid
  3. CIt is a tribasic acid
  4. DIt is harmful for eyes

Correct answer

B. It is not a proton donor, but a weak Lewis acid

Step-by-step solution

Orthoboric acid is a weak mono basic acid with K a =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. B OH 3 + 2 H - O - H → B OH 4 - + H 3 O +

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