Chemistry, asked by PrathamR, 1 year ago

A student has been collecting silver coins and copper coins. One day she observed a black coating on
silver coins and green coating on copper coins. Give the chemical name of black and green coating.
How are they formed?

Answers

Answered by anuritha
8
when silver reacts with hydrogen sulphide in the air, it given silver sulphide which gives the black colour on the surface of the silver metal  
2Ag+ H2S⇒Ag2S+H2

when copper is exposed to the moisture in the air , the produce copper carbonate which is responsible  for the green colour in the coins 
Cu+O2+CO2+H20⇒CuCO3.Cu(OH)2

anuritha: i am sorry friend friend i couldn't write the equations in the correct way
anuritha: and adding to this ....this two reactions occurs due to a basic phenomenon called oxidation
PrathamR: No probs, anyway thank you
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