Question

Discuss the basic nature of the hydroxides of Al and B.

Answer 1

Aluminium hydroxide is amphoteric in nature, i.e., it has both basic and acidic properties. Closely related are aluminium oxide hydroxide, AlO(OH), and aluminium oxide or alumina (Al2O3), the latter of which is also amphoteric. These compounds together are the major components of the aluminium ore bauxite.

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Answer 2

All of these have -OH groups covalently bound to the atom from period 3. These compounds are all acidic - ranging from the very weakly acidic silicic acids (one of which is shown below) to the very strong sulphuric or chloric(VII) acids.

There are other acids (also containing -OH groups) formed by these elements, but these are the ones where the Period 3 element is in its highest oxidation state.