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When copper is exposed to atmosphere for...

When copper is exposed to atmosphere for a longer time, a green mass deposits on its surface. Discuss the chemical reaction involved.

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To understand the formation of the green mass on copper when it is exposed to the atmosphere for a long time, we can break down the process into several steps: ### Step 1: Oxidation of Copper When copper is exposed to moist air, it undergoes oxidation. The reaction involves copper (Cu) reacting with oxygen (O₂) present in the air. **Chemical Reaction:** \[ 2 \text{Cu} + \text{O}_2 \rightarrow 2 \text{CuO} \] This reaction forms copper(II) oxide (CuO), which is a black solid. ...
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