Explain why the surface of some metals acquires a dull appearance when – InterviewSolution

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1.	Explain why the surface of some metals acquires a dull appearance when exposed to air for a long time.
Answer» Solution :The surface of some metals acquires a dull appearance when exposed to AIR for a LONG TIME DUE to the formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of the various gases present in air.

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