A student has been collecting silver coins and copper coins. After some days, when she took out the coins to count, she observed a black coating on silver coins and green coating on copper coins. Which chemical phenomenon is responsible for such coatings? Write the chemical reactions involved.
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HELLO DEAR,
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
I HOPE ITS HELP YOU DEAR,
THANKS
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