If you collect silver coins and copper coins, after some days a black coating on silver coins and a green coating on copper coins appear. Which chemical phenomenon is responsible for these coatings? Write the chemical name of these black and green coatings.

If you collect silver coins and copper coins, after some days a black

1.	If you collect silver coins and copper coins, after some days a black coating on silver coins and a green coating on copper coins appear. Which chemical phenomenon is responsible for these coatings? Write the chemical name of these black and green coatings.
Answer» Solution :CORROSION is responsible for this coating on the coins. Black coating is due to the formation of `Ag_2S` and GREEN coating is due to the formation of `CuCO_3.Cu(OH)_2`