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Q.

Is it true that some metals become dull and lose their shine (lustre) because of the action of air and moisture on their surface?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
The shiny appearance of any material is termed lustre. However, some metals lose their shine and become dull with time. When exposed to air, the surface of these metals reacts with the moisture in the air, and the metal loses its shine and becomes dull. This is known as corrosion. For example, the action of air and moisture on iron forms a dull layer of a compound on its surface called rust. This corrosion of iron is called rusting. So, the action of moisture and air makes a metal lose its shine and become dull.
 
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