Answer:
as dust and other particles get stuck on to it. it can also be due to rust
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:
as dust and other particles get stuck on to it. it can also be due to rust
Verified answer
Answer:
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.