What is the nature of bleaching powder?

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RRB JE Previous Paper 1 (Held On: 22 May 2019 Shift 2)
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  1. Reducing agent
  2. Blistering agent
  3. Sulphonating agent
  4. Oxidising agent

Answer (Detailed Solution Below)

Option 4 : Oxidising agent
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Bleaching powder by its nature is an Oxidising agent.

  • Stable bleaching powder is widely used as a disinfectant in water purification, as well as in the textile and pulp and paper industries.
  • "Bleaching powder" is made by the action of chloride gas on calcium hydroxide.
  • The reaction being essentially:
  • 2Ca (OH)2 + 2Cl2 → Ca(OCl)2 + CaCl2 + 2H2O.
  • In the production of bleaching powder, slaked lime spread on the floors of large rectangular chambers of lead or concrete is exposed to chlorine gas.
  • Bleaching powder, a solid combination of chlorine and slaked lime, was introduced in 1799 by Scottish chemist Charles Tennant.
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