Answer: CuCO3.Cu(OH)2
Notes: When copper is exposed to air, it reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is basic copper carbonate (CuCO3. Cu(OH)2). The formation of this green coating on the surface of a copper object corrodes it.
- Cu + H2O(g) + CO2 —> [CuCO3.Cu(OH)2]
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