Redox reactions worksheet with answers, including oxidation numbers, oxidizing and reducing agents, and balanced chemical equations.

Final Answer:
11. a. sulfate — S⁶⁺, b. Sn — Sn⁰, c. S²⁻ — S²⁻, d. Fe²⁺ — Fe²⁺, e. Se⁴⁺ — Se⁴⁺, f. nitrate — N⁵⁺, g. ammonium — N³⁻, h. I⁻ — I¹⁻
12. a. CrO₄²⁻ — Cr⁶⁺, b. Na₂Cr₂O₇ — Cr⁶⁺, c. CrSO₄ — Cr²⁺, d. chromate — Cr⁶⁺, e. dichromate — Cr⁶⁺
13. a. H₂S → SO₂: S²⁻ → S⁴⁺ → oxidized; O₂ → H₂O: O⁰ → O²⁻ → reduced
 b. HNO₃ → NO: N⁵⁺ → N²⁺ → reduced; H₂ → H₂O: H⁰ → H¹⁺ → oxidized
 c. KMnO₄ → MnCl₂: Mn⁷⁺ → Mn²⁺ → reduced; HCl → Cl₂: Cl¹⁻ → Cl⁰ → oxidized
 d. Sb + HNO₃ → Sb₂O₅ + NO: Sb⁰ → Sb⁵⁺ → oxidized; N⁵⁺ → N²⁺ → reduced
14. a. oxidizing agent: sulfate; reducing agent: carbon
 b. oxidizing agent: nitrogen; reducing agent: iodine
 c. oxidizing agent: permanganate; reducing agent: chloride
 d. oxidizing agent: nitrogen; reducing agent: antimony