H3BO3 is

  1. A

    monobasic and weak Lewis acid.

  2. B

    dibasic and weak Lewis acid.

  3. C

    monobasic and strong Lewis acid.

  4. D

    tribasic and weak Bronsted acid.

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    Solution:

    The boron atom in boric acid, H3BO3 is electron deficient, thereby it acts as a Lewis acid with one vacant p-orbital. There is no d-orbital in boron atom, hence it can accommodate only one electron pair in its vacant p-orbital. This implies that boric acid is a weak Lewis acid.

    Boric acid is a monobasic acid which undergoes ionization with water and releases proton from it.

    H3BO3+H2OB(OH)4-+H+

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