Paheli bought a statue made of copper

cbse
cbse-class-8-science
materials-metals
and-nonmetals

#1

Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.

Answer:
The green material is a mixture of copper hydroxide and copper carbonate formed due to reaction of copper with moist air (water, oxygen and carbon dioxide).