Chemical Process
Good quality of edible salt is obtained from brine by the process of

Electrolysis
Freeze drying
Vacuum evaporation
Solar evaporation

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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

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

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