What is the green colour coating that forms on copper when it is left open?
When exposed to the atmosphere, copper forms a layer of copper carbonate which has a green shade. This is responsible for the phenomenon of copper turning green when left in the open.
When copper vessels are exposed to moist air for a long time, a green coating is formed. Which are the constituents of the coating? (i) Copper hydroxide (ii) Copper carbonate (iii) Copper oxide