Answer to Question #347667 in General Chemistry for gem

Question

To do: Identify the oxidizing agent and reducing agent in the reactions.

1. 2Na2S2O3+I2→Na2S4O6+2NaI

2. 2FeCl3+H2S→2FeCl2+S+2HCl

3. 3Mg+N2→Mg3N24.AgCN+CN−→[Ag(CN)2]−

Answer 1

1.

2Na₂⁺S₂²⁺O₃^2- +I₂⁰ = Na₂⁺S₄^2,5+O₆^2- + 2Na⁺I^-

4S²⁺ - 2e^- => 4S^2,5+ — reducing agent

I₂⁰ + 2e^- => 2 I^- — oxidizing agent

2.

2Fe³⁺Cl₃^- + H₂⁺S₂^- = 2Fe²⁺Cl₂^- + S⁰ + 2H⁺Cl^-

2Fe³⁺ +2e^- => 2Fe²⁺ — oxidizing agent

2S^- - 2e^- => 2S⁰ — reducing agent

3.

3Mg⁰ + N₂⁰= Mg₃²⁺N₂^3-

3Mg⁰ - 6e^- => 3Mg²⁺ — reducing agent

N₂⁰ + 6e^- => 2N^3- — oxidizing agent

4.

Ag⁺(CN)^- + (CN)^- => [Ag⁺(CN)₂^-]^-

Ag⁺ => Ag⁺

(CN)^- => (CN)^-

this is not a oxidation- reduction reaction