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Q.

Graphite is used as lubricant in high temperature machinery because :
 

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a

inorganic graphite can also be used.

b

hexagonal layers slide over each other

c

in between two layers van der Waals' force is present.

d

it is a dry lubricant.
 

answer is A, B.

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Detailed Solution

Graphite is used as lubricant in high-temperature machinery because it has hexagonal layers sliding over each other and in between two layers, van der Waals' force is present.

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