Question

Cottrell precipitator acts on which of the following principle?
a) Hardy-Schulze rule
b) Distribution law
c) Le Chatelier's priciple
d) Neutralization of  charge on the colloid particles
(Please provide proper explanation for the appropriate answer.)

Answer 1

Cottrell precipitator =>
A machine for removing dusts and mists from gases , in which the gases passes through a grounded pipe with a fine axial wire at a high negative voltage , and particles are ionized by the corona discharge of the wire and migrate to the pipe.
so the correct option is 
d) Neutralization of charge on the colloid particles.