Chemical Process
Bromine is used in the preparation of

All of these
Dyes and antiknock compounds
Fire extinguishing compounds
Fire proofing agents

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

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