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

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Chemical Process
Presence of sodium tripolyphosphate (an additive) in synthetic detergent

Does not allow redeposition of dirt on the cleaned surface
Inhibits its corrosive effects
None of these
Facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions)

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