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10/09/2021 8:53 pm
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Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.
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10/09/2021 8:54 pm
The surface of some metals acquires a dull appearance when exposed to air for a long time because metals form a thin layer of oxides, carbonates or sulphide on their surface by the slow action of various gases present in air.