A 47-Year-Old Male and Father of Five Works as a High

question 23

Multiple Choice

A 47-year-old male and father of five works as a high school English teacher. He recently read in the community newspaper that local sewage is treated and repurposed to the community as drinking water. His senior English class is concerned about the quality of drinking water in the city and they want to petition the state senate to pass a bill barring the practice. He comes to the local health department asking for information.
-Which gas is used as a mode of purification in the final phase of treatment?

• A)Hydrogen
• B)Carbon dioxide
• C)Ammonia
• D)Chlorine

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