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B
addition of electrolyte
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C
neutralisation of charge on colloids
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D
Le Chatelier's principle
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Solution
The correct option is C neutralisation of charge on colloids
Smoke coming out of the chimney in industrial area is a nuisance and health hazard. It is a colloidal particles which are charged particles and thus they are removed from fuel gases by electrical precipitation (Cottrell Precipitator) which involves neutralisation of charged colloidal particles present in the smoke.