Bleaching Powder (Uses) MCQs Quiz | Class 10
Class: X, Subject: Science (Code 086), Unit: Unit I: Chemical Substances – Nature and Behaviour, Topic: Bleaching Powder (Uses). This quiz covers the chemical properties, preparation, disinfection capabilities, and industrial applications of bleaching powder. Submit your answers to check your score and download the PDF solution.
About Bleaching Powder (Calcium Oxychloride)
Bleaching powder is chemically known as Calcium Oxychloride (CaOCl2). It is produced by the action of chlorine gas on dry slaked lime, Ca(OH)2. It plays a significant role in various industries due to its strong oxidizing and disinfecting properties.
Key Uses and Applications
- Textile Industry: Used for bleaching cotton and linen in the textile industry to remove natural colors and make the fabric white.
- Paper Industry: Used for bleaching wood pulp in paper factories to produce white paper.
- Laundry: Used for bleaching washed clothes in laundries.
- Disinfectant: Used for disinfecting drinking water to make it free of germs and harmful bacteria.
- Chemical Industry: Used as an oxidizing agent in many chemical industries.
Chemical Properties
| Property | Description |
|---|---|
| State & Color | Pale yellowish powder with a strong smell of chlorine. |
| Solubility | Soluble in cold water (insoluble residue is lime). |
| Reaction with Acid | Releases chlorine gas when reacting with dilute acids. |
| Exposure to Air | Slowly loses chlorine upon exposure to air due to reaction with CO2. |
Quick Revision Notes
- Formula: CaOCl2
- Common Name: Chloride of lime.
- Preparation Equation: Ca(OH)2 + Cl2 -> CaOCl2 + H2O
- Active Ingredient: Chlorine is the active ingredient responsible for bleaching action.
Extra Practice Questions
- What is the chemical name of bleaching powder? (Answer: Calcium oxychloride)
- Which gas is released when bleaching powder reacts with dilute sulphuric acid? (Answer: Chlorine)
- Why does bleaching powder smell strongly of chlorine? (Answer: Because it gives off chlorine on exposure to air/CO2)
- Name the raw material used along with chlorine to prepare bleaching powder. (Answer: Dry slaked lime)
- What is the role of bleaching powder in water treatment plants? (Answer: Disinfectant/Germ killer)
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