Q45 / 180 · AIIMS 2008 · Chemistry

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.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

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 $\mathrm{H}_2 \mathrm{SO}_4$.

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

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