Chemical Process
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

Sulphate/kraft
Mechanical
Sulphite
Neutral sulphite semi-chemical

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

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

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