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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Chemical Process
Comparing sulphate process with sulphite process, we find that __________ in the later.

Pressure is more in the former whereas temperature is less
Both temperature & pressure in the former is less than that
Temperature is more in the former whereas pressure is more
Both temperature & pressure in the former is more than that

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