Which substance is used to disinfect drinking water and can release chlorine?
Answer and explanation
Correct answer: Bleaching powder
Bleaching powder is commonly represented at school level as calcium oxychloride, CaOCl₂, and is a chlorine-releasing disinfectant. In contact with water or dilute acids, it can produce hypochlorous acid or chlorine-containing species that destroy many microorganisms. Therefore option A is correct for drinking-water disinfection. Gypsum is a calcium sulphate material, washing soda is sodium carbonate, and copper sulphate has different uses and is not the intended chlorine-releasing disinfectant here.
Frequently asked questions
What is the correct answer to this question?
Bleaching powder
Why is this the correct answer?
Bleaching powder is commonly represented at school level as calcium oxychloride, CaOCl₂, and is a chlorine-releasing disinfectant. In contact with water or dilute acids, it can produce hypochlorous acid or chlorine-containing species that destroy many microorganisms. Therefore option A is correct for drinking-water disinfection. Gypsum is a calcium sulphate material, washing soda is sodium carbonate, and copper sulphate has different uses and is not the intended chlorine-releasing disinfectant here.
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.
