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NDA 2022 GAT · General Knowledge · Acids, Bases and Salts · medium

Bleaching powder is prepared by passing chlorine gas over dry slaked lime. Its chemical formula is

Single correct option

Bleaching powder is prepared by passing chlorine gas over dry slaked lime. Its chemical formula is
  1. A. CaCl2
  2. B. CaCO3
  3. C. Ca(OCl)3
  4. D. CaOCl2
Show answer and solution

Answer: (D) CaOCl2

Ca(OH)2 + Cl2 gives CaOCl2 + H2O. Bleaching powder is used in disinfecting drinking water and as a bleaching agent. CaCl2 is calcium chloride, a drying agent, CaCO3 is limestone, and Ca(OCl)3 is not a valid formula since calcium is divalent.
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Original question written in the NDA 2022 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake