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Redox Reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions1 Mark
MCQ
Note : In the following questions a statement of assertion $(A)$ followed by a statement of reason $(R)$ is given. Choose the correct option out of the choices given below each question.
Assertion $(A)$ : The decomposition of hydrogen peroxide to form water and oxygen is an example of disproportionation reaction.
Reason $(R)$ : The oxygen of peroxide is in $–1$ oxidation state and it is converted to zero oxidation state in $\mathrm{O}_2$ and –2 oxidation state in $\mathrm{H}_2 \mathrm{O}$.
  • ✓
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
  • B
    Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
  • C
    $A$ is true but $R$ is false.
  • D
    Both $A$ and $R$ are false.
✓

Answer

Correct option: A.
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
$2\text{H}_2\text{O}_2\text{(ag)}\xrightarrow{ \ \ \ \ \ \ \ \ }2\text{H}_2\text{O(l)}+\text{O}_2\text{(g)}$
Here the oxygen of peroxide, which is present in $-1$ state, is converted to zero oxidation state in $\mathrm{O}_2$ undergoing oxidation and decreases to $-2$ oxidation state in $\mathrm{H}_2 \mathrm{O}$ undergoing reduction.

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