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

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

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Chemical Process
Use of hydrated lime in water treatment

Is to adjust the pH value
After filtration, combats the corrosive-ness of water due to the presence of O₂ & CO₂
All of these
Before filtration, reduces the bacterial load on filters

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