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
Removing some quantity of SO₃ during intermediate stage
Putting more quantity of V₂O₅ catalyst in the converter

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloromethane
Dichloro-diphenyl-trichloroethane

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