Which gas is used to prepare bleaching powder?
Answer and explanation
Correct answer: Chlorine
The governing concept is the preparation and chemical use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to produce bleaching powder, commonly represented at school level as CaOCl₂. Chlorine also explains its bleaching and disinfecting action. Thus option B is correct. Hydrogen and nitrogen do not provide the required active chlorine, while carbon dioxide is not the gas used in this preparation.
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 chemical use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to produce bleaching powder, commonly represented at school level as CaOCl₂. Chlorine also explains its bleaching and disinfecting action. Thus option B is correct. Hydrogen and nitrogen do not provide the required active chlorine, while carbon dioxide is not the gas used in this preparation.
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.
