NURSING ANM AND GNM

Detailed explanation-1: -Answer and Explanation: Chlorine is a halogen used in gaseous and liquid form for large scale disinfection of drinking water and sewage.

Detailed explanation-2: -Halogens. Worldwide, chemical disinfection with halogens-chiefly chlorine and iodine-is the most commonly used method for improving and maintaining the microbiologic quality of drinking water.

Detailed explanation-3: -Answer and Explanation: The halogen referred to in the question is chlorine. It is used widely as a disinfectant for drinking water and treatment of wastewater (sewage). Both liquid and gaseous forms of chlorine are used for this purpose because these forms are readily dissolvable in waters.

Detailed explanation-4: -Chlorine is a strong oxidizing disinfectant that has been used to treat drinking water supplies for more than 60 yr.