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What is the nature of `Al_(2)O_(3)` ? (Acidic/Basic)

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What is the nature of `Al_(2)O_(3)` ? (Acidic/Basic)
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Amphoteric, it reacts with an acid as well as with base.
`Al_(2)O_(3)+6HCl to 2AlCl_(3)+ 3H_(2)O`
`Al_(2)O_(3)+2NaOH + 3H_(2)O to 2Na[Al(OH)_(4)]`
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