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In moist air, copper corrodes to produce...

In moist air, copper corrodes to produce a green layer on the surface. Give reason.

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In presence of moist air, a thin film of green basic copper carbonate is formed on its surface and hence copper corrodes.
`2Cu + O_(2) + H_(2)O + CO_(2) rarr underset("Green")(CuCO_(3).Cu(OH)_(2))`
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