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Assertion (A): Graphite is used as a dry lubricant in machines which run at high temperatures
Reason (R) : The layers of graphite slip one over the other when pressure is applied
The correct option among the following is

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(A) is true but (R) is false

(A) is false but (R) is true

(A) and (R) are true. (R) is the correct explanation of (A)

(A) and (R) are true, but (R) is not correct explanation of (A)

answer is C.

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Detailed Solution

Graphite can be used as a lubricant because it has a layered crystal structure, where carbon atoms form hexagonal lattices that are held together by weak Van der Waals forces. So, these layers slip one over the other when pressure is applied.

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