1. Mn⁺⁴ + 2e⁻ = Mn⁺² se reduce; MnO2 = agent oxidant
2Cl⁻¹= Cl2 + 2e⁻ se oxideaza; HCl = agent reducator
MnO2 + 4HCl = Cl2 + MnCl2 + 2H2O
2. 3ₓ| Ag⁰ = Ag⁺ + 1e⁻ se oxideaza; Ag = agent reducator
1ₓ N⁺⁵ + 3e⁻ = N⁺² se reduce; HNO3 = agent oxidant
3Ag + 4HNO3 = 3AgNO3 + NO+ 2H2O
3. 4ₓ| 2I⁻ = I2 + 2e⁻ se oxideaza ; KI = agent reducator
1ₓ| S⁺⁶ + 8e⁻ = S⁻² se reduce; H2SO4 = agent oxidant
8KI + 9H2SO4 = 4I2 + 8KHSO4 +H2S + 4H2O
4. 2ₓ| Mn⁺⁷ + 5e⁻ = Mn⁺² se reduce; KMnO4= agent oxidant
5ₓ| 2Cl⁻ = Cl2 + 2e⁻ se oxideaza; HCl = agent reducator
2KMnO4 + 16HCl = 5Cl2 + 2KCl + 2MnCl2 + 8H2O
