________ is slippery to touch, hence used as a lubricant.

Coke

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Lamp black

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Graphite

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Fullerene

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Solution

The correct option is C Graphite
Graphite consists of hexagonal rings forming parallel plates held by weak wander Waals forces. In this, each carbon is $s p^{2}$ hybridized.
These hexagonal sheets can slip over each other thus they are used in a lubricant.

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