Question

Give reason-

Cottrell's smoke precipitator is fitted at the mouth of chimney used in factories

Answer 1

Smoke coming out of the chimneys contain a lot of unburnt carbon particle. Smoke is the colloidal solution of the solid particles such as carbon, arsenic, dust particles etc. These particles are injurious to health and have to be precipitated . Carbon particle are charged particles and can not be precipitated. Thus a metal plate of oppositely charged particle is used for their precipitation. This is done by the cottrell smoke precipitator which neutralizes the charge on the carbon particles and neutralizes them. In this way smoke coming out of the chimneys gets free from the charged particles .