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Bleaching powder and bleach solution are produced on a large scale and used in several household products. The effectiveness of bleach solution is often measured by iodometry.

Question: Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is
ChemistryRedox ReactionsJEE AdvancedJEE Advanced 2012 (Paper 2)
Options:
  • A $\mathrm{Cl}_{2} \mathrm{O}$
  • B $\mathrm{Cl}_{2} \mathrm{O}_{7}$
  • C $\mathrm{ClO}_{2}$
  • D $\mathrm{Cl}_{2} \mathrm{O}_{6}$
Solution:
2701 Upvotes Verified Answer
The correct answer is: $\mathrm{Cl}_{2} \mathrm{O}$
$\mathrm{Ca}(\mathrm{OCl}) \mathrm{Cl} \longrightarrow \mathrm{Ca}^{2+}+-\mathrm{OCl}+\mathrm{Cl}^{-}$

-OCl (Hypochlorite ion) is anion of the acid HOCl which on dehydration gives $\mathrm{Cl}_{2} \mathrm{O}$.

$2 \mathrm{HOCl} \longrightarrow \mathrm{H}_{2} \mathrm{O}+\mathrm{Cl}_{2} \mathrm{O}$

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