Water Distribution Grade 1 Certification Practice Exam

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Study for the Water Distribution Grade 1 Certification Exam. Engage with flashcards and carefully curated multiple choice questions, each supported by hints and explanations. Prepare for your certification test!

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Which form of available chlorine is known for its effectiveness in killing bacteria?

Combined chlorine
Free chlorine
Organic chlorine
Aromatic chlorine

The correct answer is: Free chlorine

Free chlorine is recognized for its effectiveness in killing bacteria and is crucial in water treatment processes. It primarily exists in two forms: hypochlorous acid (HClO) and hypochlorite ion (ClO-), both of which are powerful disinfectants. When added to water, free chlorine swiftly reacts with bacteria, viruses, and other microorganisms, effectively inactivating them and preventing the spread of waterborne diseases. In contrast, combined chlorine refers to chlorine that has already reacted with organic matter and is less effective as a disinfectant. While organic chlorine and aromatic chlorine pertain to chemical compounds that contain chlorine, they do not serve as effective germicides in the water purification context. Thus, the role of free chlorine as a rapid and potent disinfectant makes it the preferred choice for ensuring clean and safe water.