Question

RAJ brought a statue made up of copper. To her surprise, it acquire a dull green coating after a couple of months . Under which condition copper develops this green coating?

Answer 1

due to humidity
humidity affects the inter molecular structure of the copper thereby affecting its colour and strength
if it remains in water for a long time than it will get rusted and can get damaged

Answer 2

Copper developes green coating because of chemical reactions of copper with some elements. A pale shiny like green coating is called as platina. The conditions for this development of green coating are: There must the presence of oxygen There must be the presence of moisure or water vapour