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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?
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
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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