Chemical Process
Pasteurisation of milk means

None of these
Inhibiting the growth of micro-organisms without killing them
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
Removal of fatty and albuminous substance from it

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

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