Public Health Sanitarian Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which of the following is not used as a coagulant in water purification?

Aluminium sulfate

Ferric sulfate

Sodium phosphate

Sodium phosphate is not used as a coagulant in water purification processes. Coagulants are chemical substances added to water to help in the aggregation of suspended particles, leading to their removal from water. Common coagulants like aluminum sulfate, ferric sulfate, and ferric chloride are effective in neutralizing the charges on suspended particles, allowing them to clump together and be removed during the sedimentation process.

Sodium phosphate, while it may have its own applications in water treatment or conditioning, does not serve the primary function of coagulation. It is often used for different purposes, such as acting as a buffer or pH adjuster, but does not effectively facilitate the coagulation process in water purification. This distinction makes sodium phosphate the correct answer for this question.

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Ferric chloride

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