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Write reactions to justify amphoteric nature of aluminium.

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It dissolve both in acids and alkalines evolving dihydrogen.
`2Al(s) + 3H_(2)SO_(4)(aq) rarr Al_(2)(SO_(4))_(3) (aq) + 3H_(2)(g)`
`2Al(s) + 2NaOH (aq) + 6H_(2)O (l) rarr underset(" Sod. Tetrahydroxoaluminate (III) ")(2 Na^(+)[Al(OH)_(4)]^(-)(aq))+ 3H_(2) (g)`

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