Question

Gaseous pollutants are controlled through
(A) Adsorption
(B) ESP
(C) Arrestors
(D) Pyrolysis
(E) Incineration

Answer 1

Hint: The criteria for gaseous substances Sulfur dioxide, nitrogen dioxide, and carbon monoxide are primary air contaminants in urban areas; these are released directly into the air from fossil fuels such as fuel oil, diesel, and natural gas that are burned in power plants, vehicles, and other combustion sources.

Complete answer: Dust, aerosols, suspended particulate matter, and other gaseous contaminants are extracted using the adsorption principle. Some devices that can monitor gaseous contaminants include electrostatic precipitators, cyclones, and scrubbers. The electrostatic field or pressure is used to keep this in place. Arrestors are devices which prevent or stop a specified thing. For solid contaminants, pyrolysis and incineration are used. For solid contaminants, pyrolysis and incineration are used. Controlling gaseous pollutants is done using the adsorption method. When these contaminants come into contact with a substance, such as water, they become toxic. Organic and inorganic molecules can be removed from a gas stream using physical adsorption. As the molecules get bigger, the adsorption affinity increases. Activated carbon, carbon molecular sieves, polymers, silica alumina, and zeolites are some of the adsorbents used in air pollution control.
Hence the correct answer is option A - adsorption.

Note:
Remember that adsorption is the process of moving gaseous pollutants from an air stream to the solid surface of an adsorbent. The most popular adsorbent is activated carbon, but zeolites, polymers, and other adsorbents can also be used.