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

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%
Water with pH value less than 7, is acidic

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

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
Pressure is more in the former whereas temperature is less

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