_______ is the hardest known substance.

Graphite

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Diamond

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Tungsten

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Fullerene

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Solution

The correct option is B Diamond
Diamond is the hardest naturally occurring substance found on Earth.so answer is diamond among the following. But it is not the hardest substance. Wurtzite boron nitride and lonsdaleite (which comes from meteorites) are both harder.

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Which is the hardest known substance? What is the chemical composition of this substance?
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Question 4

(i) Name a metal that is soft and can be cut with a knife.

(ii) Name a non-metal that is the hardest substance.

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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