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Chlorine gas interacts with dry slaked lime, Ca(OH)2, at 40°C to produce a compound commonly known as bleaching powder. Which of the following represents the correct reaction?

1. CaOCl2 + 2HCl → CaCl2 + H2O + Cl2
2. Chlorine gas reacts with dry slaked lime, Ca(OH)2, at 40°C to form bleaching powder
3. Ca(OH)2 + Cl2 → CaOCl2 + H2O
4. None of these

Correct answer: Ca(OH)2 + Cl2 → CaOCl2 + H2O

Solution

The reaction of chlorine gas with dry slaked lime (Ca(OH)2) at 40°C produces bleaching powder (CaOCl2) and water. This is a well-known reaction in inorganic chemistry.

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