The oxidation states of Cr in [Cr(H2O6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2) (NH3)] respectively are ______.

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The oxidation states of Cr in [Cr(H2O6]Cl3, [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2) (NH3)] respectively are +3, 0 and +6. Explanation: Hydrogen peroxide (H2O2) acts as a reducing agent in an alkaline (basic) medium, converting Fe3+ to Fe2+. The reaction is: \ce{Fe^{3+} + H2O2 + OH- -> Fe^{2+} + O2 + H2O} Sodium peroxide (Na2O2) reacts with water to produce hydrogen peroxide and sodium hydroxide, creating the necessary alkaline condition for the reduction to occur: \ce{Na2O2 + 2H2O -> 2NaOH + H2O2}

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