Chemical Process
Use of hydrated lime in water treatment

Is to adjust the pH value
Before filtration, reduces the bacterial load on filters
All of these
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂

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Chemical Process
Reverse osmosis is normally used for the

Purification of oxygen
Separation of isotopes of uranium from gaseous uranium hexaflouride
Separation of helium from natural gas
Desalination of brackish water to produce potable (drinking) water

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