Graphite is used as lubricant due to :

The slippery nature

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Its giant structure

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High refractive index

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High IP value of carbon

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Solution

The correct option is A The slippery nature
The layers of graphite are held together by weak forces between the free electrons of either layers. Since this force can be broken easily, the layers slide on one another. Due to this slippery property, graphite is used as a lubricant.

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