KCET · Chemistry · Hydrogen
\( \mathrm{H}_{2} \mathrm{O}_{2} \) is
- A An oxidising agent
- B A reducing agent
- C Both oxidising and reducing agent
- D Neither oxidising nor reducing agent
Answer & Solution
Correct Answer
(C) Both oxidising and reducing agent
Step-by-step Solution
Detailed explanation
\( \mathrm{H}_{2} \mathrm{O}_{2} \) can act as both oxidizing as well as reducing agent in both acidic and basic media.
Oxidizing action:
In acidic media,
\( 2 \mathrm{~F} e^{2+}+2 \mathrm{H}^{+}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~F} e^{3+}+2 \mathrm{H}_{2} \mathrm{O} \)
In basic media, \( 2 \mathrm{~F} e^{2+}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~F} e^{3+}+2 \mathrm{OH}^{-} \)
Reducing action:
In acidic media,
\( \mathrm{HOCl}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_{2} \)
In basic media,
\( \mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{OH}^{-} \rightarrow 2 \mathrm{I}^{-}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \)
Oxidizing action:
In acidic media,
\( 2 \mathrm{~F} e^{2+}+2 \mathrm{H}^{+}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~F} e^{3+}+2 \mathrm{H}_{2} \mathrm{O} \)
In basic media, \( 2 \mathrm{~F} e^{2+}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~F} e^{3+}+2 \mathrm{OH}^{-} \)
Reducing action:
In acidic media,
\( \mathrm{HOCl}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_{2} \)
In basic media,
\( \mathrm{I}_{2}+\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{OH}^{-} \rightarrow 2 \mathrm{I}^{-}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \)
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