alleryBleaching powder used in disinfection of water has the formula:
ACaO
BCa(OH)₂
CCaOCl₂
DCaCO₃
Answer & Solution
Correct answer: C. CaOCl₂
1. Bleaching powder, CaOCl₂ (calcium oxychloride / calcium hypochlorite mix).
2. Prepared by passing Cl₂ over dry slaked lime: Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O.
3. Used to bleach cotton/linen and as a swimming-pool / water-supply disinfectant.
_Source: syllabus Science Ch 2 §2.4.1 Bleaching Powder_
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