Single Answer MCQ
Q-00019216
What is formed when copper is exposed to moist air?
1
Iron oxide
2
Copper oxide
3
Copper carbonate
4
Copper sulfate
Answer and Solution
Answer
C. Copper carbonate
Solution:
Copper reacts with moisture and carbon dioxide in the air to form copper carbonate, which appears as a green patina. Other oxides and sulfates do not form under these conditions.
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