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

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

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Chemical Process
Liquefaction of gases can not be done by

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

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Chemical Process
Pick out the true statement pertaining to water treatment.

Application of activated carbon reduces the temporary hardness of water
Slow sand filters can remove colour completely
Activated carbon can be used for taste & odour control without subsequent filtration
Normally, the turbidity is removed by adding a coagulent prior to sedimentation

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