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Why is Al(2)O(3) amphoteric oxide?...

Why is `Al_(2)O_(3)` amphoteric oxide?

Text Solution

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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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Al_2O_3 is an amphoteric oxide.

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

Knowledge Check

  • Which of the following statements is//are correct? I. B_(2)O_(3) is an acidic oxide II. Ga_(2)O_(3) and Al_(2)O_(3) are amphoteric oxides. III. In_(2)O_(3) and tl_(2)O_(3) are basic oxides.

    A
    `I,II,III`
    B
    `I,II`
    C
    `II,III`
    D
    `I,III`

  • Al_(2)O_(3) reacts with

    A
    only water
    B
    only acids
    C
    only alkalis
    D
    both acids and alkalis

  • Statement-1: Al forms H_(2) when reacts with NaOH. Statement-2: Al_(2)O_(3) is amphoteric by nature. Statement-3: Al_(2)O_(3) is a neutral oxide.

    A
    FFT
    B
    FTT
    C
    TFF
    D
    TTF

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    Gallium oxide (Ga_(2)O_(3)) is an amphoteric oxide.

    Al_2O_3 is an amphoteric oxide. With the help of chemical equations, explain why is it called an amphoteric oxide?

    A sample of clay is found to have the formula Al_(2)O_(3).K_(2)O.6SiO_(2) . Calculate the percentage of alumina (Al_(2)O_(3)) , potassium oxide (K_(2)O) and silica (SiO_(2)) in the sample.

    Which of the following sets mismatched regarding the nature of oxides? (A) Neutral oxides - \(CO_{2},NO\) (B) Amphoteric oxides - BeO,\(Al_{2}O_{3}\) (C) Acidic oxides - \(Cl_{2}O_{7},NO_{2}\) (D) Basic oxides - \(Na_{2}O,BaO\)

    Assertion (A) : Al(OH)_(3) is amphoteric in nature. Reason (R) : Al-O and O-H bonds can be broken with equal ease in Al(OH)_(3) .

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