Chemical Process
Oil is a/an

Mixture of glycerides of fatty acids
Ester of alcohols other than glycerine
Solid at normal temperature
Mixture of glycerides

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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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