50 Student has been collecting silver coins and copper coins. One day – InterviewSolution

1.	50 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 coating? Write the chemical name of black and green coatings?
Answer» 50 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 coating? Write the chemical name of black and green coatings?

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