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Amphoteric oxides, examples and experiment on verification of amphoteric oxides

Answer Text:
Amphoteric oxides
- Are oxides, which behave as both bases and acids.
- Are mainly oxides of certain metals in the middle
group of the periodic table.
Examples
Oxides of Zn, Al, Pb
Experiment: - To verify amphoteric oxides
Procedure
- A small sample of aluminium oxide is placed in a test tube and #5 cm^3# of 2M nitric acid added to it and the mixture shaken.
- The procedure is repeated in different test tubes with
ZnO, PbO, CuO and CaO.
- The experiments are repeated using excess 2M sodium
hydroxide in place of nitric acid