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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations1 Mark
MCQ
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:
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.
  • A
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • C
    $A$ is true, but $R$ is false.
  • ✓
    $A$ is false, but $R$ is true.
✓

Answer

Correct option: D.
$A$ is false, but $R$ is true.

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