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Q.

Identify the incorrect statement with regard to water purification by coagulation.

[A] Particles suspended in water are in colloidal form.

[B] Suspended particles carry a positive charge.

[C] Suspended particles due to similar charge repel each other.

[D] When alum is added it works as a coagulant.

Answer & Explanation
Answer: Suspended particles carry a positive charge.

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