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JEE Main 20188 April
Exam
JEE Main
Year
2018
Date
8 April
Subject
Chemistry
Chapter
Hydrogen

JEE Main 2018 · 8 April · Chemistry · Hydrogen

Hydrogen peroxide oxidises [Fe (CN) _ 6 ] ^ 4 - to [Fe (CN) _ 6 ] ^...

Hydrogen peroxide oxidises [Fe(CN)6]4−to[Fe(CN)6]3−{\left[Fe{\left(CN\right)}_{6}\right]}^{4 -}to{\left[Fe{\left(CN\right)}_{6}\right]}^{3 -} in acidic medium, but reduces [Fe(CN)6]3−to[Fe(CN)6]4−{\left[Fe{\left(CN\right)}_{6}\right]}^{3 -}to{\left[Fe{\left(CN\right)}_{6}\right]}^{4 -} in alkaline medium. The other products formed are, respectively

Options

  1. AH2Oand(H2O+OH−){H}_{2}Oand\left({H}_{2}O + {OH}^{-}\right)
  2. B(H2O+O2)andH2O\left({H}_{2}O + {O}_{2}\right)and{H}_{2}O
  3. C(H2O+O2)and(H2O+OH−)\left({H}_{2}O + {O}_{2}\right)and \left({H}_{2}O + {OH}^{-}\right)
  4. DH2Oand(H2O+O2){H}_{2}Oand\left({H}_{2}O + {O}_{2}\right)

Correct answer

D. H2Oand(H2O+O2){H}_{2}Oand\left({H}_{2}O + {O}_{2}\right)

Step-by-step solution

Hydrogen undergoes the following changes:

1) While acting as an oxidising agent in an acidic medium,

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

2) While acting as a reducing agent in an alkaline medium,

H2O2+2OH−→O2+2H2O+2e−{H}_{2}{O}_{2} + 2{OH}^{-}\overset{}{\to}{O}_{2} + 2{H}_{2}O + 2{e}^{-}

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