To prepare bleaching powder, chlorine is passed over which substance?
Answer and explanation
Correct answer: Dry slaked lime
Bleaching powder is manufactured by passing chlorine gas over dry slaked lime, calcium hydroxide, Ca(OH)₂. The reaction produces bleaching powder, commonly represented as CaOCl₂ in school chemistry. The lime must be dry because excess moisture interferes with the process. Common salt, gypsum, and washing soda are not the starting solid, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Dry slaked lime
Why is this the correct answer?
Bleaching powder is manufactured by passing chlorine gas over dry slaked lime, calcium hydroxide, Ca(OH)₂. The reaction produces bleaching powder, commonly represented as CaOCl₂ in school chemistry. The lime must be dry because excess moisture interferes with the process. Common salt, gypsum, and washing soda are not the starting solid, so 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.
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