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Write reactions to justify amphoteric na...

Write reactions to justify amphoteric nature of aluminium .

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`to` Amphoteric nature means having acidic as well as basic nature.
`to` Aluminium reacts with both mineral acids as well as aqueous alkalis.
a) Reaction with mineral acid :
Al reacts with dil.HCl and liberates hydrogen gas.
`2Al + 6HCl to 2AlCl_3 + 3H_2 uarr`
b) Reaction with aqueous alkali :
`Al` reacts with aqueous alkali (NaOH) and liberates hydrogen gas.
`2Al + 2NaOH + 6H_2 O to Na_2 [Al(OH)_4] + 3H_2 uarr`
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Knowledge Check

  • Which is not amphoteric

    A
    `Al^(+3)`
    B
    `Cr^(+3)`
    C
    `Fe^(+3)`
    D
    `Zn^(+2)`

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