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Hydrogen — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrogen5 Marks
Question
Write chemical reactions to justify that hydrogen peroxide can function as an oxidising as well as reducing agent.
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Answer

Hydrogen peroxide, $\text{H}_2\text{O}_2$ acts as an oxidizing as well as a reducing agent in both acidic and alkaline media.
Reactions involving oxidizing actions are:
  1. $2\text{Fe}^{2+}+2\text{H}^{+}+\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }2\text{Fe}^{3+}+2\text{H}_2\text{FO}$
  2. $\text{Mn}^{2+}+\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }\text{Mn}^{4+}+2\text{OH}^-$
  3. $\text{PdS}+4\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }\text{PdSO}_4+4\text{H}_2\text{O}$
  4. $2\text{Fe}^{2+}+\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }2\text{Fe}^{3+}+2\text{OH}^-$
Reactions involving reduction actions are:
  1. $2\text{MnO}_4^-+6\text{H}^{+}+5\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }2\text{Mn}^{2+}+8\text{H}_2\text{O}+5\text{O}_2$
  2. $\text{I}+\text{H}_2\text{O}_2+2\text{OH}^-\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }2\text{I}^-+2\text{H}_2\text{O}+\text{O}_2$
  3. $\text{HOCl}+\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }\text{H}_3\text{O}^{+}+\text{Cl}^-+\text{O}_2$
  4. $2\text{MnO}_4^-+3\text{H}_2\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ \ \ }2\text{MnO}_2+3\text{O}_2+2\text{H}_2\text{O}+2\text{OH}^-$

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