Chemical Process
The chamber process is

Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
None of these
Non-catalytic and operates only on pyrites
A batch process for directly producing high strength (98 to 100%) H₂SO₄

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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

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

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