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In the elutriation leg of a commercial crystallizer containing a mixture of coarse and very fine crystals of the same material, a liquid is pumped vertically upward. The liquid velocity is adjusted such that it is slightly lower than the terminal velocity of the coarse crystals only. Hence

  1. the very fine and coarse crystals will both be carried upward by the liquid
  2. the very fine and coarse crystals will both settle at the bottom of the tube
  3. the very fine crystals will be carried upward and the crystals will settle
  4. the coarse crystals will be carried upward and the very fine crystals will settle
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