Explain the concept of Exchange Electron

The idea of exchanging electron, x₂ (g) + 3y₂ (g) → 2xy₃

This reaction is known as oxidation reduction reaction,

The actual reaction,

N₂ (g) + 3H₂ (g) ↔ 2NH₃

0          0          ↔ – 3 + 1

The oxidation number of H atom 0 → +1. So the oxidation number increases. The oxidation number of N atom 0 → – 3. So the oxidation number decreases. H₂ releases 1 electron and N₂ receive 3 electron. To equal the oxidation number H₂ multiply by 3. In the reaction, oxidation -reduction occurs.