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

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

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Chemical Process
Pick out the false statement pertaining to water treatment.

The zeolite water softening process reduces the hardness of water by not more than 50%
Sodium sulphate or sodium carbonate do not cause hardness in water
Aeration of water is effective in CO₂ removal
Water with pH value less than 7, is acidic

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