- The green coating on copper exposed to air is called patina. - Patina is formed by the reaction of copper with moisture, oxygen, and carbon dioxide. - The main component of green patina is basic copper carbonate.
When copper reacts with moist carbon dioxide (CO₂) in air, it forms a green coating of which one of the following compounds ?
Asked in UPSC CDS 2 2021 · Topic: Metals, Minerals, Ores: Properties, Uses (Corrosion of metals: causes, mechanism (rusting), and prevention methods (galvanization, anodizing, electroplating, alloying, painting))
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