Chemical Process
Nickel is not used as a catalyst in the

Hydrogenation of oil
Fischer-Tropsch process
Ostwald's process of HNO₃ manufacture
Shift conversion

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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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