On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compound?

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Q: 51 (NDA-I/2019)
On exposure to moist air, copper gains a green coat on its surface due to formation of which one of the following compound?

question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,5,8,5,1,6,1