Chemical Process
Viscose rayon is chemically

Cellulose nitrate
Regenerated cellulose acetate
Cellulose acetate
Regenerated cellulose nitrate

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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

All of these
Tar neutralises the residual acids present in pitch
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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