Question

Why do silver articles turn black and copper turns green after sometimes?

Answer 1

Silver turns black when exposed in atmosphere is due to the reaction of silver with hydrogen sulphide present in atmosphere. the chemical reaction is. 2Ag(s) +H2s(g)=Ag2 (s) +H2(g). Copper turns green in colour when it comes in contact with moist air the green substance is known as copper carbonate.the reaction is. 2Cu+co2+o2 +H2O=Cuco3.cu(OH)2. are both the examples of corrosion of metal

Answer 2

Hello friend !
Here's ur answer!
Silver articles turn black and copper turns green after sometimes
due to the presence presence of moisture and acid in the atmosphere which corrodes the metal. here, hydrogen sulphide changes silver to black and moisture in the atmosphere changes copper to green.


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Thanks!! ! ☺