Question : Copper substances when exposed to air, gain a green coating due to the formation of:
Option 1: CuO
Option 2: CuCO3.Cu(OH)2
Option 3: CuSO4
Option 4: Cu(NO3)2
Correct Answer: CuCO 3 .Cu(OH) 2
Solution : The correct option is CuCO 3 .Cu(OH) 2.
Copper turns green when it comes into contact with air because copper carbonate forms. This covering that has a greenish hue is called "patina." Carbon dioxide, oxygen from the air, and copper combine to produce it. This patina mostly consists of copper carbonate, which can include copper (II) carbonate (CuCO 3 ) as well as basic copper carbonate (CuCO 3 . Cu(OH) 2 ).
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