Jai was very fond of collecting coins of different metals. one day he observed that the colour of Silver and copper coins had changed explain reason for his observation
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This is because they came into the contact of moisture and oxygen present in the air . changing of silver to black color is called tarnish and changing of copper to green color is called corrosion and iron's is called rusting.
copper reacted with moist Carbon Dioxide ( CO2 ) in the air and it slowly lost its shiny brown surface and gained a green coat. That green substance so formed was of Copper Carbonate
black coating on Silver for the fact that Silver reacted with sulphur in the air and formed a black coating of Silver Sulphide ( AgS ).
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