Chemical Process
Esterification reaction

Is a reaction between an alcohol and an organic acid
All of these
Is reversible
Produces soap

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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
All of these
It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Its calorific value is very less

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