Graphite is used as a lubricant due to:

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The slippery nature

The giant structure

High refractive index

High IP value of carbon

answer is B.

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Detailed Solution

Concept: In graphite, the carbon atoms are directed in the same plane and

hybridised, forming hexagonal rings.
One layer can slide over the other because there are only weak forces of attraction holding the two consecutive layers together, making the graphite pliable and a good lubricant.
All of the carbon atoms in the graphite structure are in stable chemical bonds with the other three carbon atoms, forming sheets that are held together by weak Van der Waals forces.
The two-dimensional sheet of graphite is made up of fused benzene rings.
Since graphite has such a large structure, it is consequently utilised as a lubricant.
Hence, the correct answer is option 2.

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