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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
For question two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
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
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • ✓
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: B.
Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
The reaction involved is,
$\text{CaOCl}_2\ \ +\ \ \text{H}_2\text{SO}_{4\text{(dilute)}}\ \ \xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\ \ \text{CaSO}_4\ \ +\ \ \text{H}_2\text{O}\ \ +\ \ \text{Cl}_2\uparrow$

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