Which gas is passed over dry slaked lime in the preparation of bleaching powder?
Answer and explanation
Correct answer: Chlorine
Bleaching powder is prepared by passing chlorine gas over dry slaked lime, whose chemical formula is Ca(OH)₂. In simplified form, chlorine reacts with calcium hydroxide to produce bleaching powder along with other products. Therefore, option B is correct. Hydrogen and oxygen do not provide the required chlorinating action, while carbon dioxide reacts differently and is not used for this preparation. The lime must be dry so that the product forms properly.
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, whose chemical formula is Ca(OH)₂. In simplified form, chlorine reacts with calcium hydroxide to produce bleaching powder along with other products. Therefore, option B is correct. Hydrogen and oxygen do not provide the required chlorinating action, while carbon dioxide reacts differently and is not used for this preparation. The lime must be dry so that the product forms properly.
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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