Chemical Process
Low purity oxygen is used for

L.D. steel making
Cutting and welding of metals
Chemical oxidation processes
Medicinal purposes

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

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

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