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

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

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Chemical Process
Enzymes are

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

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