Question

lustre of the surface of aluminium is last after fewday​

Answer 1

Lustre of aluminum fades away after a few days because of the formation of an inert layer of aluminum oxide on its surface. This layer prevents aluminum from reacting further.

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Answer 2

Air contains oxygen and moisture. The surface of aluminum vessels react with this moisture and oxidizes which leads to the formation of oxides which have a dull colour hence the surface of aluminum loses its lusture.

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