Choose the correct alternative from the following :
Assertion (A) : Graphite is slippery and used as a lubricant.
Reason (R) : Graphite has free electrons.
Option:
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.
E. Both A and R are false
Answer: B . Both A and R are true but R is NOT the correct explanation of A.
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Justification:
Graphite possesses a layer structure with two successive layers held by weak force 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.
