Chemical Process
Low purity oxygen is used for

Chemical oxidation processes
Medicinal purposes
L.D. steel making
Cutting and welding of metals

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Chemical Process
Pasteurisation of milk means

None of these
Removal of fatty and albuminous substance from it
Inhibiting the growth of micro-organisms without killing them
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics

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Chemical Process
Linde process of gas liquefaction employs

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

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