Question

In a coal power plant, electrostatic precipitators are installed to control emission of

• A. $S{O}_2$
• B. $N{O}_2$
• C. SPM
• D. CO

Answer 1

Answer: (C)

SPM

A. Sulphur dioxide is a poisonous gas and leads to acid rain.

B. Nitrogen dioxide is a pungent smelling gas and it can also result in acid rain.

C. The suspended particulate matter is the aerosol particles suspended in air.

D. Carbon monoxide (CO) is a colourless, odourless and a toxic gas.

Through electrostatic precipitators, particulate matter present in the dirty air is charged electrically and passed through a chamber where these particles lose their charge and settle down. Hence, in a coal power plant, electrostatic precipitators are installed to control emission of suspended particulate matter or SPM.

So, the correct answer is 'SPM'.