Copper reacts with moist carbon dioxide in the air to form a green-coloured
A
Copper oxide
B
Copper carbonate
C
Copper chloride
D
Copper carbide
Correct Option:
B
Explanation
Copper exposed to moist air slowly reacts with oxygen, carbon dioxide and water, forming a green coating consisting mainly of basic copper carbonate. This is the familiar green patina seen on old copper objects. It is not simply copper oxide or copper chloride.
