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Q.

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

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a

Al

b

Na

c

Cu

d

Ca

answer is C.

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Detailed Solution

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Calcium forms an amphoteric oxide.
When an oxide can act as an acid or a base to produce salt and water in a reaction, such oxide is known as amphoteric oxide. Amphoterism is oxidation states which are open to a chemical species. When Metals have different oxidation states amphoteric oxides and hydroxides are formed.
The reactions are:
As a basic oxide,
Al2O3 + 6HCl → 2AlCl3 + 3H2O
As an acidic oxide,
Al2O3 + 2NaOH → 2NaAlO2 + H2O

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