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प्रश्न
A student has been collecting silver coins and copper coins. One day she observed a black
coating on silver coins and a green coating on copper coins. Which chemical phenomenon is
responsible for these coatings? Write the names of black and green coatings.
उत्तर
Silver gets tarnished when exposed to the atmosphere which contains pollutant H2S and forms
a black coating of Ag2S.
Copper forms a green deposit on its surface when exposed to moist air. This is usually basic
copper (II) sulphate.
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