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Assertion : Bleaching powder reacts with dilute acids to evolve chlorine.
Reason : The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.
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Reason : The chlorine liberated by the action of dilute acids on bleaching powder is called available chlorine.
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The correct answer is:
If both assertion and reason are true but reason is not the correct explanation of assertion.
The reaction involved is
$\mathrm{CaOCl}_2+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CaSO}_4+\mathrm{H}_2 \mathrm{O}+\mathrm{Cl}_2$
The available chlorine may be defined as the \% of chlorine liberated when one mole of bleaching powder $(127 \mathrm{~g})$ is treated with excess of dilute $\mathrm{H}_2 \mathrm{SO}_4$.
$\mathrm{CaOCl}_2+\mathrm{H}_2 \mathrm{SO}_4 \rightarrow \mathrm{CaSO}_4+\mathrm{H}_2 \mathrm{O}+\mathrm{Cl}_2$
The available chlorine may be defined as the \% of chlorine liberated when one mole of bleaching powder $(127 \mathrm{~g})$ is treated with excess of dilute $\mathrm{H}_2 \mathrm{SO}_4$.
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