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Which of the following is formed by the action of chlorine on dry slaked lime?
Calcium oxide
Hydrochloric acid
Calcium chloride
Bleaching powder
Bleaching powder
Bleaching powder is formed by the action of chlorine gas on dry slaked lime (calcium hydroxide). The chemical formula for bleaching powder is commonly represented as CaOCl2тАЛ.
Bleaching powder is formed by the action of chlorine gas on dry slaked lime (calcium hydroxide). The chemical formula for bleaching powder is commonly represented as CaOCl2тАЛ.
Just like adding seasoning to flour to change its properties, reacting chlorine gas with dry powdery slaked lime transforms it into a powerful bleaching and disinfecting agent used in water treatment and laundering.
Slaked lime + Chlorine = Bleaching powder (SCB)
Ca(OH)2тАЛ+Cl2тАЛтЖТCaOCl2тАЛ+H2тАЛO тАФ Action of chlorine on dry slaked lime
When dry slaked lime (Ca(OH)2тАЛ) is treated with chlorine gas (Cl2тАЛ), bleaching powder is produced along with water. The reaction can be represented as: Ca(OH)2тАЛ+Cl2тАЛтЖТCaOCl2тАЛ+H2тАЛO.
Dry slaked lime is chemically known as calcium hydroxide (Ca(OH)2тАЛ).
Chlorine gas is obtained as a by-product during the chlor-alkali process.
Bleaching powder is yellowish-white in color and has a strong smell of chlorine.
Used for bleaching cotton and linen in the textile industry.
Used for disinfecting drinking water to make it free of germs.
Loses chlorine content on prolonged exposure to air due to reaction with CO2тАЛ.
Water treatment plants for purification
Textile industry for bleaching fabrics
Paper industry for bleaching wood pulp
Calcium oxide (CaO) is quicklime, not slaked lime.
Hydrochloric acid (HCl) is a strong acid, not a solid reactant used here.
D is correct тАФ Bleaching powder is formed by the action of chlorine on dry slaked lime.
Remember that chlorine used in this reaction is a by-product of the electrolysis of aqueous sodium chloride (brine solution) in the Chlor-Alkali process.
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