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Question

Which of the following statement (s) about H3BO3 is / are correct?

A
It is a strong tribasic acid.
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B
It is prepared by acidifying an aqueous solution of borax
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C
It has a layer structure in which planar BO3 units are joined by hydrogen bonds.
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D
It does not act as proton donor as it acts as a lewis acid by accepting lone pair hydroxyl ions.
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Solution

The correct options are
B It is prepared by acidifying an aqueous solution of borax
C It has a layer structure in which planar BO3 units are joined by hydrogen bonds.
D It does not act as proton donor as it acts as a lewis acid by accepting lone pair hydroxyl ions.
It has a layer structure in which planar BO3 units are joined by hydrogen bonds.

Preparation: Precipitated by acidifying an aqueous solution of borax.
Na2B4O7+2HCl+5H2O2NaCl+4H3BO3

It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion.
B(OH)3+2H2OB(OH)4+H3O+

Hence option b, c, d are correct.

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