Chemical Process
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

Has larger production capacity per unit cell
Consumes less power per ton of Cl₂ produced
Produces high purity (70%) caustic soda directly
All of these

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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
Desalination of brackish water to produce potable (drinking) water
Separation of helium from natural gas

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