Question

been collecting silver coins and copper coins one day observed black coating on silver coins and green coating on copper coins give chemical name of black and green coating how are they formed​

Answer 1

Black coating on silver coins is silver sulphide. ... Green coating on copper is copper carbonate. It is formed by reaction of copper with carbon dioxide, moisture and oxygen in the atmosphere.

Hope it helps you

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Answer 2

black coating on silver coin it is a silver sulphide and Green coating on copper coin it is a copper carbonate.

They formed and react with oxygen and it is formed

I hope it is help u