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Q.

Which of the following is produced on the reaction of bleaching powder with a few drops of conc. HCl?

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a

Chlorine

b

Calcium oxide

c

Hypochlorous acid

d

Oxygen

answer is C.

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Detailed Solution

  • The bleaching powder has a chemical formula as CaOCl2. 
  • When conc. HCl is added, it acts to release chlorine gas as indicated below:
    CaOCl2 + 2HCl → CaCl2 + H2O + Cl2
  • So the bleaching powder reacts with the dil. HCl to release Cl2, water and calcium chloride.
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