Practice Problems: Redox Our (Answer Key)

1. Define the oxidation number of the elements in respectively of the following compounds:
   
   ampere. H₂CO₃
   H: +1, O: -2, HUNDRED: +4
   
   b. N₂
   N: 0
   
   c. Zn(OH)₄^2-
   Zn: 2+, H: +1, ZERO: -2
   
   diameter. NO₂^-
   N: +3, O: -2
   
   east. LiH
   Li: +1, NARCOTIC: -1
   
   f. Fe₃O₄
   Feat: +8/3, O: -2
   
   
   
2. Determine the variety being oxidized and reduced at each of the following reactions:
   
   a. Cr⁺ + Sn⁴⁺ Cr³⁺ + Sn²⁺
   Cr⁺: oxidized, Sn⁴⁺: lowered
   
   b. 3 Pounds²⁺ + 2 Fe (s) 3 Hg₂ + 2 Fe³⁺
   Hg²⁺: reduced, Fe: oxidized
   
   c. 2 As (s) + 3 Pcs₂ (g) 2 AsCl₃
   As: oxidized, Cl₂: saved
   
   
   
3. Intend him apply a oxidating agent or decrease emissary in order for the followers reactions to occur?
   
   a. ClO₃^- Co₂   reducing agent
   
   b. CONSEQUENTLY₄^2- S^2-   lowering emissary
   
   c. Mn²⁺ MnO₂   oxidizing agent
   
   d. S ZnCl₂   oxidizing agent
   
   
   
4. Write balanced equations for the after redox backlashes:
   
   a. 2 NaBr + Cc₂ 2 NaCl + Br₂
   
   b. Fe₂O₃ + 3 CO 2 Fe + 3 CO₂ in acidic find
   
   c. 5 CO + I₂O₅ 5 A₂ + I₂ in primary solution
   
   
   
   
5. Post balanced equations for the following reactions:
   
   

   a. Cr(OH)₃ + Br₂ CrO₄^2- + P^- in basic solution
   
   10 OH^- + 2 Cr(OH)₃ + 3 Br₂ 2 CrO₄^2- + 8 H₂O + 6 Br^-

   b. O₂ + Your H₂O₂ + SbO₂^- in bottom solution
   
   2 OH^- + 2 Sb + 3 O₂ + 2 H₂O 2 SbO₂^- + 3 H₂O₂

   hundred. HCOOH + MnO₄^- CO₂ + Mn²⁺ in sour solution
   
   6 H⁺ + 2 MnO₄^- + 5 HCOOH 2 Mum²⁺ + 8 H₂O + 5 CO₂

   d. ClO₂^- Clock₂ + Cl^- in acidic solution
   
   5 ClO₂^- + 4 H⁺ 4 ClO₂ + Cc^- + 2 H₂O

   
   
   
6. Writing the balances half reactions of the following reactions:
   
   a. NiO₂ + 2 H₂O + Feeling Ni(OH)₂ + Fe(OH)₂ in basic solution
   
   2 H₂O + NiO₂ + 2 e^- Ni(OH)₂ + 2 OH^-
   
   2 OH^- + Fem Fe(OH)₂ + 2 sie^-
   
   b. CO₂ + 2 NH₂EGAD CO + NITROGEN₂ + 3 H₂O inbound basic solution
   
   CO₂ + H₂O + 2 e^- CO + 2 OUT^-
   
   2 OH^- + 2 NH₂OH NORTHWARD₂ + 2 e^- + 4 H₂O
   
   c. 2 H⁺ + HYDROGEN₂OXYGEN₂ + 2 Feat²⁺ 2 Fe³⁺ + 2 HYDROGEN₂O in acidic solution
   
   H₂O₂ + 2 ze^- + 2 H⁺ 2 EFFERVESCENCE₂ O
   
   Fem²⁺ Fee³⁺ + e^-
   
   d. H⁺ + 2 HYDROGEN₂CIPHER + 2 MnO₄^- + 5 SO₂ 2 Man²⁺ + 5 HSO₄^- in acidic solution
   
   8 H⁺ + MnO₄^- + 5 ze^- Mn²⁺ + 4 H₂O
   
   SO₂ + 2 H₂O HSO₄^- + 3 H⁺ + 2 e^-