Question

a student has been collecting silver coins and copper coins. one day he obseved that a black coating on the silver coins and a green coating on the copeer coins. give the chemaical names of the balck and silver coating. how are they formed?

Answer 1

Hi , there !!;

here is your answer :-

a student black coating on Silver coins because as you know that many type of gases present in atmosphere like carbon dioxide nitrogen sulphur dioxide etc


in atmosphere when the sulphur dioxide is react with silver it turns into black in colour


the reaction that take place between the silver and Sulphur dioxide is

Ag + So2 => Ag2SO4


date of formation of silver Sulphate there is development of black colour on the surface of silver.


in the case of copper when the copper is react with Sulphur Dioxide resulting in development of green coating of copper sulphate on the surface of copper.


reaction that show reaction between Copper and Sulphur dioxide

Cu + So2 => CuSo4



through the reaction there is development of green colour of coating on copper




hope it helps !!

thanks !!

Ranjan kumar