Question 2025 of 223 · California Water Treatment Operator Exam
Which form of chlorine is most effective as a disinfectant?
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 2025
- A: Hypochlorous acid (HOCl)
Explanation
HOCl is a much stronger disinfectant than OCl-. As pH rises, more HOCl converts to OCl-, so disinfection is more effective at lower pH.
More questions: Water Treatment Processes
- 2026Chlorine demand is defined as
- 2027A plant adds 3.2 mg/L of chlorine and has a free chlorine residual of 0.8 mg/L. What is the chlorine demand?
- 2028The point where adding more chlorine produces a rise in free chlorine residual in proportion to the dose is called
- 2029What is the main reason chloramines are used as a secondary disinfectant in some distribution systems?
- 2031The CT value used in disinfection is calculated as
- 2032A clearwell provides a T10 contact time of 40 minutes with a free chlorine residual of 1.2 mg/L. What is the CT?