General Science • ChemistryHard
What is the chemical composition of the coating formed on copper vessels when exposed to moist air for a long duration?
A. Black copper oxide
B. Green basic copper carbonate✓ Correct Answer
C. White zinc carbonate
D. Red copper sulfide
💡 Solution & Explanation
Copper reacts slowly with moisture, carbon dioxide, and oxygen in damp air to form a green coating consisting of a mixture of copper carbonate and copper hydroxide, commonly known as basic copper carbonate. This process is an example of atmospheric corrosion similar to rusting in iron. Silver tarnishes black due to sulfur compounds in air rather than green carbonate.
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