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Assertion (A) Graphite is slippery and used as a lubricant. Reason (R) Graphite has free electrons.

if both A and R are true and R is the correct explanation of A
if both A and R are true and R is not the correct explanation of A
if A is true but R is false
if A is true but R is true

Correct Answer: if both A and R are true and R is not the correct explanation of A

Explanation:

In graphite, each carbon atoms is linked to three other carbon atoms, while one electron in the carbon atom is delocalised. So, graphite has free electrons and it is also used as a lubricant but reason does not explains assertion.

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