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

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
All of these

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Chemical Process
Pick out the wrong statement pertaining to nitric acid.

About 90% of nitric acid is manufactured by Ostwald
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO₂)
Arc process of nitric acid manufacture is economical as compared to Ostwald
It is a strong mono basic acid which reacts with almost all the metals except noble metals

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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Maintaining low temperature & pressure in the converter
Increasing the oxygen concentration
Putting more quantity of V₂O₅ catalyst in the converter
Removing some quantity of SO₃ during intermediate stage

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