21. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)
22. To get ultrafine particles, the equipment used is a
23. A tube mill as compared to a ball mill
24. Tank filter (e.g., Nutsch filter) is
25. Vacuum filter is most suitable for the
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