Bleaching powder and bleach solution are produced on a large scale...

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

Options

A $\mathrm{Cl}_{2} \mathrm{O}$
B $\mathrm{Cl}_{2} \mathrm{O}_{7}$
C $\mathrm{ClO}_{2}$
D $\mathrm{Cl}_{2} \mathrm{O}_{6}$

Correct answer

A. $\mathrm{Cl}_{2} \mathrm{O}$

Step-by-step 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}

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