Question

student has been collecting silver coins and copper coins one day she observed a black coating on Silver coin and a green coating on copper coin which phenomenon is responsible for these coating? write the chemical name of black and green coating

Answer 1

when silver react with hydrogen sulphide in presence of air (oxygen)

to form a silver sulphide in black colour

Equation is :-

2Ag + H2S ---------- Ag2S +H2

copper metal is naked to moist air(oxygen)

due to

formation of copper carbonate ( corrosion of copper) it develops a green layer

Equation is:-

2Cu + O2 + CO2 + H2O → CuCO3.Cu(OH)2

Answer 2

THE PHENOMENON RESPONSIBLE FOR THIS THING IS CORROSION...
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PLZZ REFER QUE NO. 9...
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