2009 · Q44
Match water-treatment processes (Aeration, RO, Filtration, UV) with contaminants removed.
general-sciencechemistry
- A3 4 2 1
- B1 2 4 3
- C3 2 4 1
- D1 4 2 3
Explanation
Aeration removes iron(3), RO removes salts(4), filtration removes colour(1), UV kills microbes(2): 3-4-1-2; closest keyed option is (a).