Discussion
Assertion (A): Hydraulic classification can be used to separate two minerals of different density even at similar particle size.
Reason (R): Settling velocity depends on density as well as on size.
Answer: C
Both are true and the reason gives the basis: the same dependence that complicates size analysis is what makes gravity concentration possible, so the effect is a tool rather than merely an error. The same physics serves two quite different purposes.
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