Which of the following statements about $\mathrm{H}_{3} \mathrm{BO}_{3}$ is not correct ?

Which of the following statements about $\mathrm{H}_{3} \mathrm{BO}_{3}$ is not correct ?
  1. It is a strong tribasic acid
  2. It is prepared by acidifying an aqueous solution of borax$\mathrm{H}_{3} \mathrm{BO}_{3}$ is a weak monobasic acid.
  3. It has a layer structure in which planar $\mathrm{BO}_{3}$ units are joined by hydrogen bonds
  4. It does not act as proton donor but acts as a Lewis acid by accepting a lone pair of electrons

Solution

1. It is not a tribasic acid.
Option (a) is incorrect for $\mathrm{H}_{3} \mathrm{BO}_{3}$
2. Aqueous solution, instead of donating the $-\mathrm{OH}$ group it breaks the $\mathrm{H}-\mathrm{OH}$ bond of water and accepts the $\mathrm{-OH}$ group from it leaving in the solution hence it is mono basic acid.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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