Chemical Process
Enzymes are

Proteins with high molecular weight (around 10, 000)
Catalyst for temperature sensitive reactions
All of these
Derived from living organisms

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Chemical Process
Linde process of gas liquefaction employs

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

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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
Its calorific value is very less
All of these
Tar neutralises the residual acids present in pitch

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