Question
Biology Question on Environmental Issues
A scrubber in the exhaust of a chemical industrial plant removes
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
Answer
Gases like Sulphur dioxide
Explanation
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.