Which of the following metals form amphoteric oxide?

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Copper

Silver

Aluminium

Iron

answer is C.

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Detailed Solution

Concept- A metal is an element that forms positive ions and has metallic bonds. An amphoteric compound is an ion or molecule that can react as both an acid and a base.
The amphoteric nature of the compound depends on the oxidation states of the oxide.
Now, Aluminium forms aluminium oxide (

{Al}_{2} O_{3}

), which reacts with both acids and bases.
In acid:

{Al}_{2} O_{3} + 6 HCl \to 2 Al {Cl}_{3} + 3 H_{2} O

Here, aluminium oxide reacts with hydrochloric acid to form aluminium chloride (

Al {Cl}_{3}

).
In base:

{Al}_{2} O_{3} + 2 NaOH + 3 H_{2} O \to 2 Na [Al (OH)_{4}]

Thus, Aluminium oxide exhibits both acidic and basic oxide characteristics, making it amphoteric.Copper, silver and iron do not form amphoteric oxide.
Hence, the correct option is (3).

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