Which gas reacts with slaked lime to make bleaching powder?
Answer and explanation
Correct answer: Chlorine
Bleaching powder is prepared by passing chlorine gas over dry slaked lime, calcium hydroxide. The reaction is commonly represented as Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O, although the product may contain related calcium compounds depending on conditions. Thus chlorine is the required gas and option A is correct. Hydrogen, oxygen, and nitrogen do not provide the characteristic chlorinating and disinfecting product, so options B, C, and D are unsuitable.
Frequently asked questions
What is the correct answer to this question?
Chlorine
Why is this the correct answer?
Bleaching powder is prepared by passing chlorine gas over dry slaked lime, calcium hydroxide. The reaction is commonly represented as Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O, although the product may contain related calcium compounds depending on conditions. Thus chlorine is the required gas and option A is correct. Hydrogen, oxygen, and nitrogen do not provide the characteristic chlorinating and disinfecting product, so options B, C, and D are unsuitable.
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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