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

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

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Chemical Process
Presence of carbonaceous matter in the sewage

Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
Reduces sulphate ions to sulphides causing obnoxious smell
Increases the quantity of chlorine used for its purification
All of these

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