|A) Both A and R are true and R is the correct explanation of A.||B) Both A and R are true but R is NOT the correct explanation of A.|
|C) A is true but R is false.||D) A is false but R is true.|
Answer: 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