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Why Al(2)O(3) is amphoteric while B(2)O(...

Why `Al_(2)O_(3)` is amphoteric while `B_(2)O_(3)` is acidic ?

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Because it reacts with acids as well as bases to form salts.
`Al_(2)O_(3)+6HCl to2AlCl_(3)+3H_(2)O`
`Al_(2)O_(3)+6NaOHto2Na_(3)AIO_(3)+3H_(2)O`
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