MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Boron and Its Compounds

Boric acid has a polymeric layer structure in which planar BO3 units are joined by

A.covalent bonds

B.two centre - two electron bonds

C.coordinate bonds✓ Correct

D.hydrogen bonds.

Explanation

49. (S) Orthoboric acid behaves as a weak monobasic acid giving H3O+ and (a) [B(OH)4]+ (b) H2BO2 + (c) [B(OH)4]– (d) H2BO2 – 2 3 4 3 4 B OH H O H O B OH + - é ù + ® + ë û

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