Complete and balance (by half-reaction method) the following equations, indicate whether the half-reaction is an oxidation or a reduction, and identify the oxidizing and reducing agents.  (a) NO2 –(aq) + Cr2O7 2–(aq)    ⟶ Cr3+(aq) + NO3 –(aq)          (acidic medium)                (b) As2O3(s) + NO3 –(aq)    ⟶    H3AsO4(aq) + N2O3(aq)       (acidic medium)                (c) MnO4 −(aq) + SO3 2−(aq)    ⟶    MnO2(s) + SO4 2−(aq)     (basic medium)                (d) CrO4 2−(aq) + Cu(s)     ⟶   Cr(OH)3(s) + Cu(OH)2(s)         (basic medium)

Chemistry: Principles and Practice
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Chapter18: Electrochemistry
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Problem 18.102QE: At 298 K, the solubility product constant for Pb(IO3)2 is 2.6 1013, and the standard reduction...
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Complete and balance (by half-reaction method) the following equations, indicate whether the half-reaction is an oxidation or a reduction, and identify the oxidizing and reducing agents. 

(a) NO2 (aq) + Cr2O7 2–(aq)    ⟶ Cr3+(aq) + NO3 (aq)          (acidic medium)

               (b) As2O3(s) + NO3 (aq)    ⟶    H3AsO4(aq) + N2O3(aq)       (acidic medium)

               (c) MnO4 (aq) + SO3 2−(aq)    ⟶    MnO2(s) + SO4 2−(aq)     (basic medium)

               (d) CrO4 2−(aq) + Cu(s)     ⟶   Cr(OH)3(s) + Cu(OH)2(s)         (basic medium)

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