Chloramine is a combination of which two elements?

Chloramine is specifically formed by the reaction of chlorine and ammonia. This compound is used in water treatment processes as a disinfectant and provides a longer-lasting residual effect compared to chlorine alone. By combining chlorine with ammonia, chloramine reduces the formation of potentially harmful disinfection byproducts that can occur with chlorine use, making it a preferred choice in certain water treatment applications.

Understanding chloramine's makeup is key in various water quality management contexts. The other combinations listed do not form chloramine. For instance, chlorine and nitrogen do not chemically combine to create any relevant disinfectant used in water treatment. Similarly, chlorine paired with oxygen or hydrogen does not yield chloramine either; these combinations would lead to different chemical compounds that do not serve the same function in water sanitation. Thus, the pairing of chlorine and ammonia is what specifically creates chloramine, making it the correct answer.