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JEE MAIN 2022
29-06-2022 - M
Question
Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium ?
Select the correct option:
A
$\mathrm{HOCl}+\mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{H}_3 \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_2$
B
$\mathrm{PbS}+4 \mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{PbSO}_4+4 \mathrm{H}_2 \mathrm{O}$
C
$2 \mathrm{MnO}_4^{-}+3 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{MnO}_2+3 \mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O}+2 \mathrm{OH}^{-}$
D
$\mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}_2 \rightarrow \mathrm{Mn}^{4+}+2 \mathrm{OH}^{-}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
In option (A) and (C) reducing action of hydrogen peroxide is shown.
In option (A) it is in acidic medium, in option (B) it is in basic medium.
or
For reducing ability $\mathrm{H}_2 \mathrm{O}_2$ changes to $\mathrm{O}_2$, i.e. oxidize , so in option 'A' & 'C' $\mathrm{O}_2$ is formed but 'A' is in acidic medium so option - C correct.
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