Assertion (A): Graphite is slippery and used as a lubricant. Reason (R

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Assertion (A):

Graphite is slippery and used as a lubricant.

Reason (R):

Graphite has free electrons.

Options:

A . If both 'A' and 'R' are true and 'R' is the correct explanation of 'A'

B . If both 'A' and 'R' are true but 'R' is not the correct explanation of 'A'

C . If 'A' is true but 'R' is false

D . If 'A' is false but 'R' is true

E . If both 'A' and 'R' are false

Answer: Option B
Answer: (b)
Graphite possesses a layer structure with two successive layers held by weak forces.
Because of such weak forces, these layers are able to slide over one another. Therefore, graphite is slippery and because of this property, it is used as a lubricant.

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