Question

if you collect silver coins and copper coins after some day a black coating on Silver coins and a green coating on copper coins which chemical phenomenon is responsible for this coatings write the chemical name of black and green coating

Answer 1

Explanation:

The phenomenon is called corrosion. The black coating is silver sulphide (Ag2S) formed due to the reaction of H2S gas present in the atmosphere with silver and the green coating is basic copper carbonate formed due to the reaction of moist air (CO2, O2 and H2O vapours) with copper

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Answer 2

Explanation:

In silver we can see a black layer this is due to the presence of hydrogen sulphide in air and reacts with silver to form a blakish layer .

since a copper coin when exposed to air gets oxidise with the oxygen in the air and later reacts with co2 and comes out in a pale green layer