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The reactants that are used for the production of bleaching powder are:
CaO + Cl
Ca(OH)₂ + Cl₂
CaO + Cl₂
CaOH + Cl₂
Ca(OH)₂ + Cl₂
Bleaching powder is produced by passing dry chlorine gas over slaked lime (calcium hydroxide). The chemical reaction yields calcium hypochlorite, calcium chloride, and water, commonly represented as Ca(OH)2+Cl2→CaOCl2+H2O.
Bleaching powder is produced by passing dry chlorine gas over slaked lime (calcium hydroxide). The chemical reaction yields calcium hypochlorite, calcium chloride, and water, commonly represented as Ca(OH)2+Cl2→CaOCl2+H2O.
Think of slaked lime like a dry sponge; when chlorine gas passes through it, the sponge absorbs the gas into its structure to create bleaching powder, which releases that chlorine power later when added to water.
Slaked Lime + Chlorine = Bleaching Powder (S + C = B, or 'Slaked Chlorine Bleaches')
Ca(OH)2+Cl2→CaOCl2+H2O — Reaction for Bleaching Powder Production
CaOCl2 — Chemical formula of Bleaching Powder (Calcium Oxychloride)
When dry chlorine gas reacts with dry slaked lime, chlorine undergoes a redox reaction (disproportionation) where it gets both oxidized and reduced to form calcium oxychloride (bleaching powder). The reaction occurs at around 40°C in specially designed plant apparatus like the Hasenclever plant.
Slaked lime must be dry because moisture reduces the effective absorption of chlorine gas.
Bleaching powder smells strongly of chlorine due to gradual reaction with atmospheric carbon dioxide.
It acts as a strong oxidizing agent and a disinfectant.
Easy to transport and store in solid form compared to liquid chlorine.
Effective disinfectant for drinking water treatment.
Loses chlorine strength upon long exposure to air.
Corrosive to metals and can cause skin/respiratory irritation.
Bleaching cotton and linen in the textile industry
Disinfecting drinking water to make it germ-free
Used as an oxidizing agent in chemical industries
Option A (CaO + Cl) is incorrect as quicklime with atomic chlorine is not the manufacturing process.
Option C (CaO + Cl2) is incorrect because quicklime reacts differently and slaked lime is required.
Option D (CaOH + Cl₂) is incorrect because the chemical formula for calcium hydroxide is Ca(OH)2, not CaOH.
B is correct — Bleaching powder is manufactured by the action of dry chlorine gas on dry slaked lime, Ca(OH)2.
Always verify chemical formulas before picking options: Calcium Hydroxide is Ca(OH)2, while Calcium Oxide is CaO. Exams often test incorrect valence formulas like CaOH.
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