Redox Reaction Questions

 

  1. Determine the oxidation number of the elements in each of the following compounds:

    a. H2CO3

    b. N2

    c. Zn(OH)42-

    d. NO2–

    e. LiH

    f. Fe3O4

  2. Identify the species being oxidized and reduced in each of the following reactions:

    a. Cr+ + Sn4+  Cr3+ + Sn2+

    b. 3 Hg2+ + 2 Fe (s)  3 Hg2 + 2 Fe3+

    c. 2 As (s) + 3 Cl2 (g)  2 AsCl3

  3. Would you use an oxidizing agent or reducing agent in order for the following reactions to occur?

    a. ClO3–  ClO2

    b. SO42-  S2-

    c. Mn2+  MnO2

    d. Zn  ZnCl2

  4. Write balance equations for the following redox reactions:

    a. NaBr + Cl2  NaCl + Br2

    b. Fe2O3 + CO  Fe + CO2 in acidic solution

    c. CO + I2O5  CO2 + I2 in basic solution

  5. Write balanced equations for the following reactions: Hint

    a. Cr(OH)3 + Br2  CrO42- + Br– in basic solution

    b. O2 + Sb  H2O2 + SbO2– in basic solution Hint

    c. HCOOH + MnO4–  CO2 + Mn2+ in acidic solution

    d. ClO2–  ClO2 + Cl– in acidic solution Hint

  6. Write the balanced half reactions of the following reactions:

    a. NiO2 + 2 H2O + Fe  Ni(OH)2 + Fe(OH)2 in basic solution

    b. CO2 + 2 NH2OH  CO + N2 + 3 H2O in basic solution

    c. 2 H+ + H2O2 + 2 Fe2+  2 Fe3+ + 2 H2O in acidic solution

    d. H+ + 2 H2O + 2 MnO4– + 5 SO2  2 Mn2+ + 5 HSO4– in acidic solution

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