Question

a student has been collecting silver coins and copper coins. one Day he observed a black coating on Silver coins and green coating on Cooper coins. which chemical phenomena is responsible for these coatings, write the chemical name of black and green coating.

Answer 1

The chemical phenomena responsible is oxidisation

Answer 2

Answer:1) oxidation

2) green coating---> 2Cu + O2 -> 2CuO

black coating----> 2Ag + O2-> 2AgO2