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When copper reacts with water in the presence of oxygen then it gets rusted.it is also a best for oxidation process.as copper is a metal when it exposed to moisture,acids they tarnish due to the formation of respective metal oxide on their surface.this process is also called as corrosion.
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Copper will under go corrosion when it reacts with moisture present in the atmosphere which will develop a green layer on it which is also called rust
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