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Which of the following is the hardest na...

Which of the following is the hardest naturally occuring substance?

A

`C_(60)` fullerene

B

Graphite

C

`C_(70)` fullerene

D

Diamond

Text Solution

Verified by Experts

The correct Answer is:
D
Diamond has the highest density `(3.5 g cm^(-3))` and the highest melting point `(3930^(@)C)` of all the allotropes of `C` and is the hardest naturally occuring substance `(10` on Moh's scale). This is because each diamond crystal is a giant molecule containing very strong covalent bonds extending in all directions. This property of diamond explains its use in oilwell drills, as an abrasive for sharpening very hard tools, and in dies for the manufacture of tungsten filaments for electric light bulbs.
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