The hardest known naturally occurring substance on Earth is ______ (fullerene/diamond).

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Solution

Diamonds are one of the crystalline allotropes of carbon that are found to be the hardest material known.
It is for the same reason that diamonds are used as a cutting tool for various purposes.
While on the other hand, fullerene is soft.
Thus, the hardest known naturally occurring substance on Earth is diamond.

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Similar questions

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

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