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Bleaching Powder MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET
Quick Facts
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10 Questions around this concept.
Solve by difficulty
MEDIUMBleaching powder is not recommended for use on colored fabrics. Which of the following is the reason for this?
Assertion: Bleaching powder is a powerful oxidizing agent.
Reason: Bleaching powder contains calcium hypochlorite, which can readily release chlorine gas, a strong oxidizing agent.
Bleaching powder is commonly used in swimming pools to disinfect the water. Which of the following is the reason for this?
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Bleaching powder is an unstable compound that decomposes over time. Which of the following is the reason for this?
Which of the following is a common use of bleaching powder?
Which of the following is a potential health hazard associated with using bleaching powder?
Concepts Covered - 1
Bleaching Powder
Preparation
- It is a mixture of CaCl2 and Ca(OCl)2.
- It is manufactured in Bachmann's plant.
- The chemical reaction for the preparation of bleaching powder is as follows:\mathrm{Ca}(\mathrm{OH})_2+\mathrm{Cl}_2 \rightarrow \mathrm{CaOCl}_2+\mathrm{H}_2 \mathrm{O}
Physical properties
- It is yellowish-white powder with smell of chlorine.
- Most of it is soluble in water but small amount is insoluble in lime.
Chemical properties
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- Reaction with insufficient and excess dilute acid:
$$
\mathrm{CaOCl}_2+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CaSO}_4+\mathrm{CaCl}_2+2 \mathrm{HCl}+\mathrm{O}_2
$$- Autoxidation: When it undergoes autoxidation, it loses its available chlorine due to which it affects its bleaching process.
$$
6 \mathrm{CaOCl}_2 \rightarrow 5 \mathrm{CaCl}_2+\mathrm{Ca}\left(\mathrm{ClO}_3\right)_2
$$- Catalytic decomposition: The catalytic decomposition of bleaching powder occurs as follows:
$$
2 \mathrm{CaOCl}_2 \xrightarrow{\mathrm{CoCl}_2} 2 \mathrm{CaCl}_2+\mathrm{O}_2
$$
Uses
- It is an oxidising agent.
- It is a chlorinating agent.
- It is used as a disinfectant.
- It sterilizes water.
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