Which gas is used to prepare bleaching powder?
Answer and explanation
Correct answer: Chlorine
The governing concept is the preparation and use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to form bleaching powder, commonly represented at school level as calcium oxychloride, CaOCl₂. Chlorine is therefore the required gas. Hydrogen, carbon dioxide, and nitrogen do not provide the active bleaching constituent in this preparation. Hence option B is correct.
Frequently asked questions
What is the correct answer to this question?
Chlorine
Why is this the correct answer?
The governing concept is the preparation and use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to form bleaching powder, commonly represented at school level as calcium oxychloride, CaOCl₂. Chlorine is therefore the required gas. Hydrogen, carbon dioxide, and nitrogen do not provide the active bleaching constituent in this preparation. Hence option B 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.
