To prepare bleaching powder, chlorine is passed over which substance?
Answer and explanation
Correct answer: Dry slaked lime
The governing preparation is the reaction of chlorine with dry slaked lime. Dry slaked lime is calcium hydroxide, Ca(OH)2, and passing chlorine over it produces bleaching powder, commonly represented as CaOCl2, along with water under the usual school-level description. Moisture is avoided because the lime must remain dry for proper preparation. Therefore A is correct.
Frequently asked questions
What is the correct answer to this question?
Dry slaked lime
Why is this the correct answer?
The governing preparation is the reaction of chlorine with dry slaked lime. Dry slaked lime is calcium hydroxide, Ca(OH)2, and passing chlorine over it produces bleaching powder, commonly represented as CaOCl2, along with water under the usual school-level description. Moisture is avoided because the lime must remain dry for proper preparation. Therefore 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.
