Smita has been collecting silver coins and copper coins one day she observed a black coaling on silver coins and green coaling of copper coins.She was amazed to see that and ask her mother about this .Her mother told her that this is due to attack of air and moisture on them . (a) Writer the chemical name of black and green coating . (b) What kind of qualities are shown by his mother.
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a)AgS for silver and CuCO3 for copper
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