12. Give reasons for the following:
a. Copper is unable to displace zinc from its salt solution.
b. Metals are used for making automobiles.
c. Graphite is used for making pencil leads.
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Answer:
Copper is less reactive than zinc. Therefore copper cannot displace zinc from its salt solution.
The main materials used for making cars, parts and components, along with future trends, are steel, aluminum, magnesium, copper, plastics and carbon fibers. The prime reason for using steel in the body structure is its inherent capability to absorb impact energy in a crash situation
Graphite is a form of Carbon and it is extremely brittle, as even application of small amount of pressure on graphite, makes it break, thus it is an excellent tool of writting without application of large amount of stress. Thus it is used in making pencil leads.
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