Answers

2014-07-24T19:20:45+05:30
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 isĀ 
d) Neutralization of charge on the colloid particles.
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