A students collected some coin make up of different metals, after some days the students observe that a coin acquired a green coating on its surface , what will be the reason ?
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Step-by-step explanation:
When a metal is attacked by substances around it such as moisture, acids , etc it is said to be corrode
In the same way when corrosion occurs on the copper coin green coating is formed
When copper is reacted with gases and moisture in atmosphere it forms copper carbonate and copper hydroxide. This gives the copper a green surface.
2cu + h2o + co2 + o2 —> cu(oh)2 + cuco3
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