Chemical Process
In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

Gives higher conversion efficiency
All of these
Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant
Has a longer life and is not poisoned by arsenic

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

Aeration of water is effective in CO₂ removal
Water with pH value less than 7, is acidic
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

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