Discussion
Hardest form of carbon is :
Answer: B
The hardest form of carbon is diamond.
In diamond each carbon atom is bonded covalently to four others in a rigid three-dimensional tetrahedral network, so there are no weak planes along which it can be scratched or cleaved easily. It stands at 10, the top of Mohs' scale.
Graphite has carbon in flat sheets held together only by weak forces, so the layers slide and it is soft enough to use as a lubricant and in pencils. Charcoal (printed 'Charcol') and coke are impure, porous, largely amorphous forms of carbon and are soft and brittle.
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