Chemical Process
Fats as compared to oils have

Less unsaturated glycerides of fatty acids
More unsaturated glycerides of fatty acids
Much higher reactivity to oxygen
Lower melting point

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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

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

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