Why can the quality of bleaching powder decrease if it is kept exposed to air for a long time?
Answer and explanation
Correct answer: Because it can gradually lose available chlorine
Bleaching powder is effective mainly because it contains available chlorine, which is released during suitable reactions and provides bleaching and disinfecting action. Prolonged exposure to air, moisture, and carbon dioxide can reduce this available chlorine through gradual chemical decomposition. Consequently, its bleaching strength falls, so option A is correct. The other choices describe no relevant chemical change and do not explain loss of effectiveness.
Frequently asked questions
What is the correct answer to this question?
Because it can gradually lose available chlorine
Why is this the correct answer?
Bleaching powder is effective mainly because it contains available chlorine, which is released during suitable reactions and provides bleaching and disinfecting action. Prolonged exposure to air, moisture, and carbon dioxide can reduce this available chlorine through gradual chemical decomposition. Consequently, its bleaching strength falls, so option A is correct. The other choices describe no relevant chemical change and do not explain loss of effectiveness.
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.
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