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2 KNO2 + 2 KI + 2 H2SO4 = I2 + 2 NO + 2 K2SO4 + 2 H2O
1e⁻ + 2H⁺ + (NO2)⁻¹ → NO + H2O Ι 2 intercambiar e⁻
2I⁻ → I₂ +2e⁻ Ι 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
2e⁻ + 4H⁺ + 2 (NO2)⁻¹ + 2I⁻ → 2NO + H2O + I₂ + 2 e⁻ (simplificar e⁻)
4H⁺ + 2 (NO2)⁻¹ + 2I⁻ → 2NO + H2O + I₂
nota: resuelve agrega la molécula de agua la faltante