Question

A student has been collecting silver coins and copper coins one day he observes a black coating on silver coins and green coating on copper coins give the chemical name of black and green coating how are they formed

Answer 1

Hey mate

Here is your answer

metals undergo corrosion in the presence of air

Just as iron has a coating of rust over it

Let’s talk about silver

Silver,in the presence of polluted air i.e. air with sulfur oxides form a black layer of SILVER SULFIDE

Now let us talk about copper

Copper, in the presence of carbon dioxide and water, forms a green layer consisting of copper hydroxide along with copper carbonate

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