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EEJ MAIN Chemistry QUESTION #7204
Question 1
Which of the following chemical equations demonstrates the oxidizing nature of hydrogen peroxide ($H_{2}O_2$)?
  • $2I^{-} + H_{2}O_{2} + 2H^{+} \rightarrow I_{2} + 2H_{2}O$✔️
  • $KIO_{4} + H_{2}O_{2} \rightarrow KIO_{3} + H_{2}O + O_{2}$
  • $Cl_{2} + H_{2}O_{2} \rightarrow 2HCl + O_{2}$
  • $I_{2} + H_{2}O_{2} + 2OH^{-} \rightarrow 2I^{-} + 2H_{2}O + O_{2}$
Correct Answer Explanation
  • An oxidizing agent is itself reduced. In option A, the oxidation state of Oxygen in $H_{2}O_{2}$ changes from $-1$ to $-2$ (in $H_{2}O$).
  • Since the oxidation state decreases, $H_{2}O_{2}$ is reduced, meaning it acted as an oxidizing agent for the Iodide ions ($I^{-}$ to $I_{2}$).