1. Tardigrade
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  3. Chemistry
  4. In which of the following reactions H2O2 acts as a reducing agent? (a) H2O2 + 2H+ + 2e- arrow 2H2O (d) H2O2 - 2e- arrow O2 + 2H+ (c) H2O2 + 2e- arrow 2OH- (d) H2O2 + 2OH- - 2e- arrow O2 + 2H2O

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Q. In which of the following reactions $ H_2O_2 $ acts as a reducing agent?
(a) $H_2O_2 + 2H^+ + 2e^- \rightarrow 2H_2O $
(d) $ H_2O_2 - 2e^- \rightarrow O_2 + 2H^+ $
(c) $H_2O_2 + 2e^- \rightarrow 2OH^- $
(d) $H_2O_2 + 2OH^- - 2e^- \rightarrow O_2 + 2H_2O $

JEE MainJEE Main 2014Redox Reactions

Solution:

The reducing agent oxidises itself.

(a) $H _{2} O _{2}^{-1}+2 H ^{+}+2 e ^{-} \longrightarrow 2 H _{2} O ^{-2}$

(b) $H _{2} O _{2}^{-1}-2 e \longrightarrow O _{2}+2 H ^{+}$

(c) $H _{2} O _{2}^{-1}+2 e \longrightarrow 2 OH ^{-2}$

(d) $H _{2} O _{2}^{-1}+2 OH ^{-}-2 e \longrightarrow O _{2}+ H _{2} O$

Note: Powers of 'O' are oxidation number of 'O' in the compound.