Question

a student has been collecting silver coins and the copper coin one day he observed 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

Corrosion is the phenomena responsible for these coatings. Black coating on silver coins is silver sulphide. It is formed by reaction of silver with hydrogen sulphide in the atmosphere. Green coating on copper is copper carbonate.

Answer 2

This reaction has occured due to the chemical process named corrosion.

The black coloured substance formed over silver is = silver sulphide

Reaction: 4Ag+2Hgs+O2----2Ag2S+2H2O

The green substance formed over copper is copper carbonate

Reaction: 2Cu+O2+H2O+CO2---2Ag2S+2H2O

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