Why do some metals lose their shine?
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The metals lose their shine on brightness on keeping in air for a long time due to formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of various gases present in air.
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Answer:
The metals lose their shine on brightness on keeping in air for long time due to formation of a thin layer of oxide , carbonate or sulphide on their surface by the slow action of various gases present in the air .
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