sblock Elements 1 Question 15
15. The chemical nature of hydrogen peroxide is
(2019 Main, 10 Jan I)
(a) oxidising and reducing agent in both acidic and basic medium
(b) oxidising and reducing agent in acidic medium, but not in basic medium
(c) reducing agent in basic medium, but not in acidic medium
(d) oxidising agent in acidic medium, but not in basic medium
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Answer:
Correct Answer: 15. (a)
Solution:
$\mathrm{H}_2 \mathrm{O}_2$ can act as both oxidising and reducing agents in both acidic and basic medium. $\mathrm{H}_2 \mathrm{O}_2$ as oxidising agent
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In acidic medium: $\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{H}^{+}+2 e^{-} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}$
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In basic medium : $\mathrm{H}_2 \mathrm{O}_2+2 \overline{\mathrm{O}} \mathrm{H}+2 e^{-} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+2 \mathrm{O}^{2-}$ $\mathrm{H}_2 \mathrm{O}_2$ as reducing agent
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In acidic medium : $\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{O}_2+2 \mathrm{H}^{+}+2 e^{-}$
In basic medium :
$ \mathrm{H}_2 \mathrm{O}_2+2 \mathrm{OH}^{-} \longrightarrow \mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O}+2 e^{-} $
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