Cottrell precipitator acts on which of the following principles?A. Hardy-Schulze ruleB. Distribution lawC. Le Chatelier’s principleD. Neutralization of charge on colloidal particles

A Cottrell precipitator works on the neutralization of charge on colloidal particles. Thus, the correct answer is:

D. Neutralization of charge on colloidal particles

Explanation:
The Cottrell precipitator is a device used to remove dust particles and other pollutants from gases (like exhaust gases from chimneys) by charging the particles with electricity.
It uses electrostatic precipitation, where colloidal particles (tiny particles suspended in a gas) are given an electrical charge as they pass through the precipitator.
These charged particles are then attracted to electrodes of opposite charge and get neutralized, allowing the particles to stick to the plates and be removed from the gas stream.
Hence, the principle is based on the neutralization of charges on colloidal particles to remove them from gases.

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