Chemical Process
Oil is a/an

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

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

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