Which of the following is NOT a common use of chlorine in water treatment?

In water treatment, chlorine is primarily utilized for its effectiveness in disinfection, odor removal, and oxidation. Disinfection involves killing bacteria and harmful pathogens to ensure the water is safe for consumption. Chlorine’s ability to effectively manage odors in water comes from its strong oxidizing properties, which can neutralize certain compounds that contribute to unpleasant smells.

Oxidation refers to the process where chlorine reacts with various contaminants in the water, such as iron and manganese, effectively removing them and enhancing water quality. Although these are significant and commonly known uses of chlorine, color removal is not typically associated with chlorine’s function in water treatment.

Color removal in water treatment often involves different methodologies, such as the use of activated carbon or other specific chemicals designed to target color-causing substances, rather than chlorine itself. Thus, the assertion that color removal is a common use of chlorine is not applicable, making it the correct choice in this scenario.