A Metal Surface Becomes Dull on Exposure to Air
A metal surface becomes dull on exposure to air is a chemical change. A metal surface becomes dull on exposure to air. Solved Classifying Matter 1 Classify Each Mixture As Chegg Com This thin layer formation of metal oxide on the metallic surface causes the dull appearance of the metals. . Physical or chemical change. If the metal surface becomes dole because of abrasion from the physical process of scratching than this is just physical change. A metal surface becomes dull because of continued abrasion. Still the same chemical just scratched up. A metal surface becomes dull on exposure to air Selected Answer. Thus the surface of some metals acquires a dull appearance when exposed to air for a long time. 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 gas
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