Q48 of 61 Page 4

Why does an aluminium vessel loose its shine so soon after use?

Aluminium is a reactive metal. As it comes in contact with air, it forms a dull and hard layer of aluminium oxide on its surface and hence looses its shine.

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46 Name the common nonmetals that are used in our daily life directly or indirectly 47 Give two reasons for aluminium being preferred to copper for manufacturing cooking utensils. 49 Silver does not combine easily with oxygen but silver jewellery tarnishes after sometime? Why? 50 Which one of the following materials is most likely to be corroded? a. a wooden plank              b. a steel chair c. an exposed iron rod       d. an iron rod coated with oil.