In the manufacture of bleaching powder, chlorine is passed over which substance?
Answer and explanation
Correct answer: Dry slaked lime
The standard preparation of bleaching powder involves passing chlorine gas over dry slaked lime, calcium hydroxide, Ca(OH)₂. The product is commonly represented as calcium oxychloride, CaOCl₂, though commercial bleaching powder can have a more complex composition. Drying is important because the process is carried out with dry slaked lime. Sodium chloride, gypsum, and washing soda are not the reactants used in this preparation. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Dry slaked lime
Why is this the correct answer?
The standard preparation of bleaching powder involves passing chlorine gas over dry slaked lime, calcium hydroxide, Ca(OH)₂. The product is commonly represented as calcium oxychloride, CaOCl₂, though commercial bleaching powder can have a more complex composition. Drying is important because the process is carried out with dry slaked lime. Sodium chloride, gypsum, and washing soda are not the reactants used in this preparation. Therefore option A is correct.
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.
