The correct answer is (A).
Getting to the Answer: Review the scientist?s viewpoint concerning the formation of hazardous substances by Cl2. According to the scientist, by-products of chemical reactions between Cl2 and organic matter are hazardous and can be toxic to humans. Additionally, "excess Cl2 can react with components of saliva, stomach fluid, and food, thus forming new-by-products which could also be toxic."
(A) Correct: The scientist believes hazardous substances are formed when Cl2 is mixed with saliva
(B) Incorrect: The scientist believes ozone is another possible disinfectant, not that hazardous substances are formed when it is mixed with Cl2
(C) Incorrect: this is the opposite of the scientist?s viewpoint; the scientist believes hazardous substances are formed when Cl2 is mixed with food
(D) Incorrect: this is the opposite of the scientists?s viewpoint; the scientist believes hazardous substances are formed when Cl2 is mixed with saliva
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