Answer to Question #347822 in Chemistry for Pampam

Question

Identify oxidizing agent and reducing agent in the reactions.

1. 2Na₂S₂O₃ + I₂ → Na₂S₄O₆+ 2Nal

2. N₂+ 3H₂ → 2NH₃

3. 2FeCl₃ + H₂S → 2FeCl₂ +S + 2HC1

4. 2 Cr³ + H₂O+ 6CIO₃ → Cr₂O₇² + 6CIO₂ + 2H+

5. 3Mg + N₂ → Mg₃N₂

Answer 1

Solution:

(1): 2Na₂S₂O₃ + I₂ → Na₂S₄O₆ + 2Nal

Oxidation half-reaction:

2S₂O₃²⁻ − 2e⁻ → S₄O₆²⁻

Reduction half-reaction:

I₂⁰ + 2e⁻ → 2I⁻

Therefore,

Na₂S₂O₃ acts as reducing agent

I₂ acts as oxidizing agent

(2): N₂ + 3H₂ → 2NH₃

Oxidation half-reaction:

H₂⁰ − 2e⁻ → 2H⁺

Reduction half-reaction:

N₂⁰ + 6e⁻ → 2N⁻³

Therefore,

H₂ acts as reducing agent

N₂ acts as oxidizing agent

(3): 2FeCl₃ + H₂S → 2FeCl₂ + S + 2HCl

Oxidation half-reaction:

S²⁻ − 2e⁻ → S⁰

Reduction half-reaction:

Fe³⁺ + e⁻ → Fe²⁺

Therefore,

H₂S acts as reducing agent

FeCl₃ acts as oxidizing agent

(4): Cr³⁺ + H₂O + 6CIO₃⁻ → Cr₂O₇²⁻ + 6CIO₂ + 2H⁺

Oxidation half-reaction:

2Cr³⁺ + 7H₂O − 6e⁻ → Cr₂O₇²⁻ + 14H⁺

Reduction half-reaction:

CIO₃⁻ + 2H⁺ + e⁻ → CIO₂ + H₂O

Therefore,

Cr³⁺ acts as reducing agent

CIO₃⁻ acts as oxidizing agent

(5): 3Mg + N₂ → Mg₃N₂

Oxidation half-reaction:

Mg⁰ − 2e⁻ → Mg²⁺

Reduction half-reaction:

N₂⁰ + 6e⁻ → 2N⁻³

Therefore,

Mg acts as reducing agent

N₂ acts as oxidizing agent