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In reverse osmosis used for desalination of sea water, the pressure applied on the sea-water side must be

  1. Aequal to the vapour pressure of the sea water
  2. Bless than the osmotic pressure of the sea water
  3. Cequal to atmospheric pressure
  4. Dgreater than the osmotic pressure of the sea water

Answer: D

Natural osmosis moves solvent from pure water to the solution. To reverse the flow, the applied pressure must exceed the osmotic pressure of the solution. Lower or equal pressure cannot push the solvent out through the semipermeable membrane.
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