Write the reaction involved in the preparation of bleaching powder from slaked lime and chlorine.
Generated by claude-sonnet-4-6 · 2026-06-17 12:37 · grounding rag
Model Answer
Bleaching powder is prepared by passing chlorine gas over dry slaked lime [Ca(OH)₂]:
$$\text{Ca(OH)}_2 + \text{Cl}_2 \rightarrow \text{CaOCl}_2 + \text{H}_2\text{O}$$
$$\text{(Slaked lime)} \hspace{1cm} \hspace{2cm} \text{(Bleaching powder)}$$
Bleaching powder is the common name for calcium oxychloride (CaOCl₂).
Source: Chapter 2, Acids, Bases and Salts (Bleaching Powder section)
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Explanation
- The examiner expects the balanced chemical equation with state symbols or at least the names of reactants and products — this fetches 1 mark.
- Naming the product as calcium oxychloride / CaOCl₂ and mentioning the condition (dry slaked lime + Cl₂) fetches the second mark.
- Although this specific equation isn't in the provided passages, it is the standard NCERT Class 10 Chapter 2 content. Write the equation clearly and state the chemical name of bleaching powder.