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Question

Although metals form basic oxides, which of the following metals form an amphoteric oxide?


A

Na

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B

Ca

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C

Al

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D

Cu

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Solution

The correct option is C

Al


Metals form basic oxides and non-metals form acidic oxides. But few metal oxides show acidic as well as basic behaviour.

Amphoteric oxide: An amphoteric oxide is an oxide that can act as an acid or as a base. Examples are aluminium oxide (Al2O3) and zinc oxide (ZnO).

The amphoteric behaviour of Al2O3 can be seen in the reactions given below. When it reacts with a base, it acts as an acid and vice-versa.

Al2O3+6HCl2AlCl3+3H2O(base)(acid)(salt)(water)

Al2O3+2NaOH2NaAlO2+H2O(acid)(base)(salt)(water)

Hence, the correct option is (C).


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