Chemical Process
__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

Ostwald's
Haber's
None of these
Solvay

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

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