Q13 / 60 · JEE Advanced 2012 (Paper 2) · Chemistry

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

  • Correct answer
    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

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

Hence, the correct answer is option: 'A'.

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