Question

1. hypochlorous acid and hypochlorite when considered together are also known as the ____.a. chlorine doseb. chlorine demandc. free chlorined. chlorine residual4. ____ is a gas that does not form carcinogenic compounds like those compounds formed by chlorine disinfection. it also is not affected by ammonia, and it is a very effective disinfectant at higher ph levels. it is also used to diminish taste and odor problems in the distribution system. it is especially useful in inhibiting legionella.a. chloraminationb. chlorine dioxidec. hydrogen peroxided. potassium permanganate

Explanation:

1. Free chlorine refers to the combined forms of hypochlorous acid (HOCl) and hypochlorite ion (OCl⁻), which are the active disinfecting species in chlorinated water.
2. Chlorine dioxide is a disinfectant gas that does not produce carcinogenic trihalomethanes like chlorine, is unaffected by ammonia, works well at high pH, reduces taste/odor issues, and is effective against Legionella.

Answer:

1. c. free chlorine
2. b. Chlorine dioxide