Question

Astha has been collecting silver coins and copper coins. One day she observed black coating on silver coins and a green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical equations involved in the formation of black and green coatings.

Answer 1

Answer: when the silver coins reacts with oxygen it forms silver oxide..

And it is in black colour...

2Ag+02=Ag20

When copper reacts with oxygen it forms cupric oxide..

And it is in green colour....

2cu+02=2cuo

Explanation:

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