On which of the following factors does the dosage of coagulants that should be added to the water NOT depend?
DSSSB JE - 2023,
Answer: D
The coagulant dose depends on the turbidity of the water (more suspended matter needs more coagulant), on its temperature (low temperature slows the reactions and flocculation and so needs a larger dose), and on the time available for settlement and the type of coagulant. The question asks for the one on which it does not depend, and the key says it is the viscosity of the water. The viscosity is itself a function of temperature, so it is not treated as a separate factor.
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