Chemical Process
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.

30 to 50
5 to 10
-5 to 0
75 to 80

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Chemical Process
Liquefaction of gases can not be done by

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

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