If copper is kept open in the air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
CuSO₄
CuCO₃
CU(NO₃)₂
CuO

Academic Chemistry NCERT Class 10

Correct Answer: (b) CuCO3

Explanation: Copper reacts with CO₂ present in the air and forms a green coating on its surface due to the formation of basic copper carbonate [CuCO₃.Cu(OH)₂] as:

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Updated on: 13-Mar-2023

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