Chemical Process
DDT should not be allowed to come in contact with iron (during its manufacture) to

Prevent sulphonation of the monochlorobenzene by the acid catalyst
Avoid its decomposition
Achieve non-hygroscopic property
None of these

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Chemical Process
Linde process of gas liquefaction employs

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

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