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Define amphoteric oxides. Give two examp...

Define amphoteric oxides. Give two examples of such oxides.

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Those metal oxides which can react with acids as well as bases to from salt and water are known as amphoteric oxides.
Ex : ZnO and `Al_(2)O_(3)`
`ZnO + 2HCl rarr ZnCl_(2) + H_(2)O`
`ZnO + 2NaOH rarr Na_(2)ZnO_(2) + H_(2)O`
`Al_(2)O_(3) + 6HCl rarr 2AlCl_(3) + 3H_(2)O`
`Al_(2)O_(3) + 2NaOH rarr 2NaAlO_(2) + H_(2)O`
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