________
is the hardest known material.
Cemented carbide
Ceramic
Diamond
Alloy steel
Diamond
Diamond
is one of the hardest substance on earth. It is hard due to its giant covalent
lattice and it has many strong covalent bonds. It has 3-dimensional network of
covalent bonds and it is very difficult to break extended covalent bonding.
Hence,
the correct option is (C).
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