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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Chemical Process
Oil is a/an

Solid at normal temperature
Ester of alcohols other than glycerine
Mixture of glycerides of fatty acids
Mixture of glycerides

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