A) gases like ozone or methane
B) gases like sulphur dioxide
C) gases like nitrous oxide
D) particulate matter of the size 5 micrometers or above.
Correct Answer: B
Solution :
: A scrubber can remove gases like sulphur dioxide. In a scrubber, the exhaust is passed through a spray of water or lime water. Water dissolves gases. The particles also become heavy and fall down. Lime reacts with sulphur dioxide to produce a precipitate of calcium sulphate or sulphite, used to remove soluble gases and particles.
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