Why can bleaching powder slowly lose its effectiveness when kept exposed?
Answer and explanation
Correct answer: It can react with moisture and carbon dioxide in air
Bleaching powder contains reactive chlorine compounds that provide its bleaching and disinfecting action. On prolonged exposure to humid air and carbon dioxide, these active constituents may undergo unwanted reactions and gradually lose available chlorine. Therefore, the powder becomes less effective with time. Option A is correct; the other options describe impossible or scientifically unrelated changes. It should be stored in a tightly closed, dry container.
Frequently asked questions
What is the correct answer to this question?
It can react with moisture and carbon dioxide in air
Why is this the correct answer?
Bleaching powder contains reactive chlorine compounds that provide its bleaching and disinfecting action. On prolonged exposure to humid air and carbon dioxide, these active constituents may undergo unwanted reactions and gradually lose available chlorine. Therefore, the powder becomes less effective with time. Option A is correct; the other options describe impossible or scientifically unrelated changes. It should be stored in a tightly closed, dry container.
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.
