_______ is the hardest known natural substance.

Graphite

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Diamond

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Fullerene

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None of these

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Solution

The correct option is B Diamond
The hardest substance is diamond because in diamond each carbon is $s p^{3}$ hybridized state and is linked to another carbon atoms held at corners of a regular tetrahedron by covalent bonds to form three-dimensional cage-like structure. Due to its strong covalent molecular structure, it is hard.

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