Pls answer this according to class 10 1st chapter (Chemical Reactions & Equations)
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silver gets black and copper gets greenish in appearance
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It is because of the deposition of rust or other compounds on Ag and Cu. When we left metals open in air they start reacting with the elements or compounds present in air in very minute amount in a very slow pace. That is why when left unused they changed colour.
Hence Ag changes from grey to black and Cu changes from reddish brown to greenish colour.
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