Q: When copper reacts with moist carbon dioxide (CO₂) in air, it forms a green coating of which one of the following compounds?
(a)Cupric carbonate
(b)Cuprous oxide
(c)Cupric oxide
(d)Copper sulphate
Correct Answer: (a)
The correct answer is (b) 'क्यूप्रस ऑक्साइड'. This question from the General Studies domain tests knowledge of Miscellaneous.