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Reverse osmosis can be used to obtain pure water from sea water when the pressure applied on the sea water side is

  1. Agreater than the osmotic pressure of the sea water
  2. Bequal to the vapour pressure of pure water
  3. Cless than the osmotic pressure of the sea water
  4. Dzero, since the membrane does all the work

Answer: A

Normal osmosis drives water into the sea water because of its osmotic pressure. To reverse the flow, the external pressure on the sea water must exceed its osmotic pressure, so that solvent is forced through the membrane to the pure-water side.
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