Chemical Process
Hydrogenation of oil/fat does not

Improve its resistance to rancid oxidation
Raise its melting point
Remove double bonds
None of these

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Chemical Process
Liquefaction of gases can not be done by

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

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