Chemical Process
The function of gypsum addition during cement making is to

Both A and B
Increase the density of cement
Neither A nor B
Decrease the cement setting rate

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

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

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