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  • Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the pro

Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed. 

 

 

 

 
 
 
 
 

Answers (1)

Sliver articles turn black when exposed in atmosphere becayse sliver reacts with hydrogen sulphide present in air and form black layer of sliver sulphide.

2Ag (s)+H_{2}S(g)\rightarrow Ag_{2}S(s)+H_{2}(g)

                                              (Black)

Copper reacts with moisture in the air and turns green in colour.

2Cu+CO_{2}+O_{2}+H_{2}O\rightarrow CuCO_{3}.Cu(OH)_{2}

                                                                  (Green)

Posted by

Sumit Saini

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