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The Cottrell smoke precipitator works on the principle of:

1. Distribution law
2. Neutralization of charge on colloids
3. Le Chatelier's principle
4. Addition of electrolytes

Correct answer: Neutralization of charge on colloids

Solution

The Cottrell precipitator works by applying a high-voltage field that imparts opposite charges to smoke particles, neutralizing their surface charge. This removes the electrostatic stabilization of the colloidal smoke, causing coagulation and settling.

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