Discussion
Assertion (A) : Graphite is slippery and used as a lubricant.
Reason (R) : Graphite has free electrons.
Answer: B
Correct answer: Both A and R are true but R is NOT the correct explanation of A.
Both statements are true, but they explain different properties. Graphite is slippery because its carbon atoms lie in flat sheets held together only by weak forces, so the layers slide over one another. The free electrons account for its electrical conductivity, not its lubricating action. R does not explain A.
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