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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
Question
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 (a), (b), (c) and (d) as given below:
  1. Both A and R are true, and R is correct explanation of the assertion.
  2. Both A and R are true, but R is not the correct explanation of the assertion.
  3. A is true, but R is false.
  4. A is false, but R is true.
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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Answer

  1. Both A and R are true, but R is not the correct explanation of the assertion.

Explanation:

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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