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
Its calorific value is very less
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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Chemical Process
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

None of these
It is very corrosive at elevated temperature
It decomposes on further increasing the temperature
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)

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