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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations1 Mark
Question
For 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: ln the reaction, $\text{Zn}_\text{(s)}+ 2\text{H}^+_{\text{(aq)}}\rightarrow\text{Zn}^{2+}_{\text{(aq)}} + \text{H}_{2_\text{(g)}}$ zinc acts as an oxidising agent and H+ acts as a reducing agent.
Reason: An oxidising agent accepts electrons while a reducing agent loses electrons.
✓

Answer

  1. A is false, but R is true.

Explanation:

$\text{Zn}_\text{(s)}+ 2\text{H}^+_{\text{(aq)}}\rightarrow\text{Zn}^{2+}_{\text{(aq)}} + \text{H}_{2_\text{(g)}}$

ln this reaction, zinc loses electrons and so it is a reducing agent, while H+ gains electrons and so it is an oxidising agent.

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