Question
Sun July 17, 2011 By:
 

what are amhoteric oxides give example.

Expert Reply
Mon July 18, 2011

Metal oxides are usually basic oxides, while those oxides of non-metals are acidic oxides. Amphoteric oxides are those oxides which show both acidic as well as basic behavior to form salts and water. Aluminium oxide  reacts in this manner with acids and bases.

            Al2O3      +          6 HCl   ?     2 AlCl3    +    3 H2O

(Acting as a base)           Acid             Salt              Water

            Al2O3      +          2 NaOH   ?     2 NaAlO2    +    H2O

(Acting as an acid)          Base                  Salt              Water

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