chlorine

a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water)

नीरजी से दो प्रकार का यौगिक बनता है : एक योगशील और दूसरा प्रतिस्थापित यौगिक।

Chlorine can be added in water for purification.