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JEE Main 20146 April
Exam
JEE Main
Year
2014
Date
6 April
Subject
Chemistry
Chapter
Hydrogen

JEE Main 2014 · 6 April · Chemistry · Hydrogen

In which of the following reactions H _ 2 O _ 2 acts as a reducing...

In which of the following reactions H2O2{H}_{2}{O}_{2} acts as a reducing agent ?

(a)H2O2+2H++2e−→2H2O\text{(a)} {\text{H}}_{2} {\text{O}}_{2} + 2 {\text{H}}^{+} + 2 {\text{e}}^{-} \to 2 {\text{H}}_{2} \text{O}

(b)H2O2−2e−→O2+2H+\text{(b)} {\text{H}}_{2} {\text{O}}_{2} - 2 {\text{e}}^{-} \to {\text{O}}_{2} + 2 {\text{H}}^{+}

(c)H2O2+2e−→2OH−\text{(c)} {\text{H}}_{2} {\text{O}}_{2} + 2 {\text{e}}^{-} \to 2 {\text{OH}}^{-}

(d)H2O2+2OH−−2e−→O2+2H2O\text{(d)} {\text{H}}_{2} {\text{O}}_{2} + 2 {\text{OH}}^{-} - 2 {\text{e}}^{-} \to {\text{O}}_{2} + 2 {\text{H}}_{2} \text{O}

Options

  1. A(a) , (b)
  2. B(c) , (d)
  3. C(a) , (c)
  4. D(b) , (d)

Correct answer

D. (b) , (d)

Step-by-step solution

Reducing agent undergoes oxidation and in oxidation half reaction there will be loss of electrons.

(b)H2O2→O2+2H++2e−(loss)\text{(b)} {\text{H}}_{2} {\text{O}}_{2} \to {\text{O}}_{2} + 2 {\text{H}}^{+} + 2 {\text{e}}^{-} (loss)

(d)H2O2+OH−→2H2O+O2+2e−(loss)\text{(d)} {\text{H}}_{2} {\text{O}}_{2} + {\text{OH}}^{-} \to 2 {\text{H}}_{2} \text{O} + {\text{O}}_{2} + 2 {\text{e}}^{-} (loss)

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