Chemical Process
White phosphorous is stored under water, because

It does not react with water
It is unstable
It is poisonous
Its kindling temperature in dry air is very low

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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
Its calorific value is very less
All of these

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