On visit to your native village, you find that lot of smoke, dust and some other gases are coming out of the chimney of a recently set up factory near the village.
  (i) As a chemistry student, what method you will suggest the factory owner to manage dust and smoke ?
(ii) What is the basic principle involved in your suggestion ?
(iii) What values are associated with your advice ? 

Explanation

(i) Dust and smoke coming out of chimney can be controlled by installing cottrell smoke precipitator.
(ii) Cottrell precipitator consists of two metal discs charged to a high electrical potential. The charge on colloidal dust and carbon particles of smoke is neutralised and they get precipitated while free gases escape out of chimney.
(iii) The knowledge of cottrell precipitator and management of dust and corbon particles of smoke can help us to clean our environment and make it healthier.