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When a strip of aluminium is dipped in concentrated nitric acid, it is oxidised to aluminium oxide (Al 2 O 3 ). It forms a protective coating on the surface of the metal and checks further attack by the acid. Therefore, aluminium becomes passive.

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85.
Why does aluminium become passive when dipped in concentrated nitric acid?

When a strip of aluminium is dipped in concentrated nitric acid, it is oxidised to aluminium oxide (Al₂O₃). It forms a protective coating on the surface of the metal and checks further attack by the acid. Therefore, aluminium becomes passive.

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