Aluminium vessels get tarnished after few days they purchased. Why?

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Solution

Explanation: This is because they presents air or oxygen and some amount of water molecules in it. After few days as they are kept outside and they are used daily the oxygen and water present in it lost. Aluminium undergoes chemical reaction with air and a covering is formed. And therefore, the luster of the surface of aluminum utensils in the house is lost after few days.

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