Which of the following is a chemical treatment in the water treatment process?

AFiltration

BSedimentation

CCoagulation ✓ Correct

DScreening

Correct answer: (C) Coagulation

Explanation

Coagulation is the chemical step in water treatment, adding agents that clump fine particles.

Chemicals like alum neutralise particle charges so they gather into flocs.

Filtration is a physical step that strains out particles.

Sedimentation is a physical step where solids settle by gravity.

Screening is a physical step removing large floating debris.

Coagulation is usually followed by flocculation, sedimentation and filtration.

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