Chemical Process
Liquefaction of gases can not be done by

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

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Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Temperature is more in the former whereas pressure is more
Pressure is more in the former whereas temperature is less
Both temperature & pressure in the former is more than that
Both temperature & pressure in the former is less than that

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Chemical Process
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
All of these
Its calorific value is very less
Tar neutralises the residual acids present in pitch

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