Which of the following is the hardest substance?

Graphite

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Carborundum

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Diamond

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Coke

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Solution

The correct option is C Diamond
In diamond, each carbon is $s p^{3}$ hybridized state and is linked to 4 other carbon atoms held at the corners of a tetrahedron by covalent bonds. Thus it forms a three-dimensional cage-like structure. Due to this strong covalent bond, it is the hardest substance.

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