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Question
Write balanced chemical equation for the following reactions:
Dichlorine heptaoxide \[\ce{(Cl2O7)}\] in gaseous state combines with an aqueous solution of hydrogen peroxide in acidic medium to give chlorite ion \[\ce{(ClO^{-}2)}\] and oxygen gas. (Balance by ion-electron method)
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Solution
\[\ce{Cl2O7 (g) + 4H2O2 (aq) -> 2ClO^{-}2 (aq) + 3H2O (l) + 4O2 (g) + 2H+ (aq)}\]
Balancing by ion-electron method:
Oxidation half: \[\ce{H2O2 -> O2 + 2e-}\]
Adding \[\ce{2H+}\] on right side to balance H atoms and charge.
\[\ce{H2O2 -> O2 + 2H^{+} + 2e-}\]
Reduction half: \[\ce{Cl2O7 + 8e- -> 2ClO^{-}2}\]
Adding \[\ce{H2O}\] and \[\ce{H+}\] to balance \[\ce{H}\] and \[\ce{O}\] atoms
\[\ce{Cl2O7 + 8e- + 6H+ -> 2ClO^{-}2 + 3H2O}\]
Adding oxidation and reduction half
\[\ce{[H2O2 -> O2 + 2e- + 2H+] × 4}\]
\[\ce{Cl2O7 + 8e- + 6H+ -> 2ClO^{-}2 + 3H2O}\]
\[\ce{Cl2O7 + 4H2O2 -> 2ClO^{-}2 + 3H2O + 4O2 + 2H+}\]
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