Which of the following chemical compounds can be used for de-chlorination of water?
A. Carbon dioxide
B. Bleaching powder
C. Sulphur dioxide
D. Chloramines
Answer: Option C
This Question Belongs to Civil Engineering >> Environmental Engineering
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Sulfur dioxide (SO2) rapidly dissolves in water to form a weak solution of sulfurous acid (H2SO3) which dissociates to produce sulfite ions (SO3)2-, which are the active dechlorinating agents.