To prepare bleaching powder, chlorine is passed over which substance?
Answer and explanation
Correct answer: Dry slaked lime
Bleaching powder is prepared by passing chlorine over dry slaked lime, whose chemical formula is Ca(OH)₂. The relevant reaction is commonly represented as Ca(OH)₂ + Cl₂ → Ca(OCl)Cl + H₂O. Therefore option A is correct. Common salt is used in the chlor-alkali process, gypsum forms plaster of Paris on heating, and washing soda is sodium carbonate; none is the direct solid used here.
Frequently asked questions
What is the correct answer to this question?
Dry slaked lime
Why is this the correct answer?
Bleaching powder is prepared by passing chlorine over dry slaked lime, whose chemical formula is Ca(OH)₂. The relevant reaction is commonly represented as Ca(OH)₂ + Cl₂ → Ca(OCl)Cl + H₂O. Therefore option A is correct. Common salt is used in the chlor-alkali process, gypsum forms plaster of Paris on heating, and washing soda is sodium carbonate; none is the direct solid used 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.
