Question

The scrubber is used mainly to remove the following gases from the exhaust after spraying water/lime.
(A) CO₂
(B) SO₂
(C) O₂ and N₂
(D) CO and CO₂

Answer 1

Hint: Scrubbers are devices which are used for air pollution control. It removes particulate matter and gases from the exhaust. Gaseous pollutants can be absorbed or can even be neutralised by a scrubber.
Step by step solution:

When pollutants are released into the atmosphere, they endanger both human health and the health of the entire planet. The World Health Organization (WHO) estimates that air pollution causes close to seven million deaths worldwide each year.
Carbon monoxide, ammonia, nitric oxide, nitrogen dioxide, ozone, particulate matter, sulphur dioxide, and volatile organic compounds are among the most significant air pollutants.
Scrubbers are devices for reducing air pollution that employ liquid to filter out gases or particles from an industrial exhaust or flue gas stream. To effectively remove particles and polluting gases from the gas flow, this atomized liquid (usually water) entrains them. A scrubber is a cleaning device whose primary function is to remove hazardous elements from waste gas or industrial air streams. Before disposing of the gases in the open air, it is required to remove gas particles that are causing many issues from the gas stream during the procedure.
Scrubbers are used to eliminate hazardous substances like nitrogen dioxide and sulphur dioxide that are produced during combustion in engines. These scrubbers filter out toxic substances and aid in lowering environmental pollution.
hence, option (B) is correct.
Note: Scrubbers can be used to remove a variety of air pollutants, specific scrubbers are formed for specific gases as well, but the general traditional scrubber used is mainly for the removal of sulphur dioxide.