Why is bleaching powder used to disinfect water?
Answer and explanation
Correct answer: It provides available chlorine
The governing concept is chemical disinfection by available chlorine. In water, bleaching powder releases chlorine-containing species that produce active chlorine, including hypochlorous acid under suitable conditions. These species oxidise and destroy many disease-causing microorganisms, making the water safer. The process does not sweeten water, convert it into a metal, or freeze it. Therefore, option A correctly explains why bleaching powder is used for disinfection.
Frequently asked questions
What is the correct answer to this question?
It provides available chlorine
Why is this the correct answer?
The governing concept is chemical disinfection by available chlorine. In water, bleaching powder releases chlorine-containing species that produce active chlorine, including hypochlorous acid under suitable conditions. These species oxidise and destroy many disease-causing microorganisms, making the water safer. The process does not sweeten water, convert it into a metal, or freeze it. Therefore, option A correctly explains why bleaching powder is used for disinfection.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
