Chemical Process
Reverse osmosis is normally used for the

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

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Chemical Process
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
None of these
It decomposes on further increasing the temperature
It is very corrosive at elevated temperature

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