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. Slaked lime is calcium hydroxide, Ca(OH)₂; when chlorine is passed over it in the dry state, bleaching powder is formed. Therefore option A is correct. Common salt is a starting material for producing chlorine industrially but is not the direct solid used in this step. Gypsum and washing soda have different compositions and roles and do not form bleaching powder in this reaction.
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. Slaked lime is calcium hydroxide, Ca(OH)₂; when chlorine is passed over it in the dry state, bleaching powder is formed. Therefore option A is correct. Common salt is a starting material for producing chlorine industrially but is not the direct solid used in this step. Gypsum and washing soda have different compositions and roles and do not form bleaching powder in this reaction.
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.
