Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative
Assertion(A) : Graphite is slippery and used as a lubricant.
Reason (R) : Graphite has free electrons.
Answer & Explanation
B) Both A and R are true but R is NOT the correct explanation of A.
Graphite possesses a layer structure with two successive layers held by weak forces and able to slide over one another. So, graphite is slippery and this property finds its use as a lubricant. In graphite, each carbon atom is linked to three other carbon atoms while one electron in the carbon atom is delocalised. So, graphite has free electrons