Discussion
Assertion (A): A powder's specific surface area and its particle size distribution give different information.
Reason (R): Surface area includes internal porosity and surface roughness that a size measurement does not see.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A gas adsorption measurement counts every accessible surface, including the inside of pores and the roughness of each particle, while a size measurement sees only the outer dimension. A powder can therefore have a large surface area and a coarse size, and the discrepancy is itself informative.
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