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

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

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

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

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