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Q.

Is it true that diamond is known as the hardest natural material?


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a

True

b

false 

answer is A.

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Detailed Solution

The above statement is true.
The two major crystalline forms of carbon are diamond and graphite. The purest form of carbon is diamond. Diamond is the hardest substance found because of its rigid structure. It is a crystalline solid with a set pattern of arrangement of particles. Its particles are closely packed with strong intermolecular forces of attraction. It is the hardest natural material as it contains a giant three-dimensional network of covalent bonds. It has a high melting point as it is very hard.
 
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