Chemical Process
Liquefaction of gases can not be done by

Adiabatic expansion against a piston or in a turbine
Exchange of heat with colder stream
Merely compressing it beyond critical pressure
Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

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Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Both temperature & pressure in the former is more than that
Temperature is more in the former whereas pressure is more
Both temperature & pressure in the former is less than that
Pressure is more in the former whereas temperature is less

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