alleryDesalination of sea water is best carried out by:
ACrystallisation of pure water
BAddition of more salt to precipitate impurities
CDistillation under reduced pressure
DReverse osmosis
Answer & Solution
Correct answer: D. Reverse osmosis
In reverse osmosis, pressure greater than the osmotic pressure of sea water is applied on the salt-water side of a semipermeable membrane, forcing pure water to flow against the natural osmotic gradient.
The membrane retains the ions, giving fresh water on the other side.
This is the basis of most industrial-scale desalination plants.
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