Created by StemPy LabIn which of these reactions do two different elements change their oxidation states, so that no single element is both oxidised and reduced?
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← A volume of 22.0 mL of 0.180 mol/L sodium nitrite is oxidised to nitrate by acidified potassium permanganate of concentration 0.0440 mol/L. The reaction is 2MnO₄⁻ + 5NO₂⁻ + 6H⁺ → 2Mn²⁺ + 5NO₃⁻ + 3H₂O. What volume of the permanganate is needed?A sample of 0.441 g of potassium dichromate, 294 g/mol, is dissolved in acid with an excess of potassium iodide. The iodine that forms is titrated with 0.144 mol/L sodium thiosulphate. The reactions are Cr₂O₇²⁻ + 6I⁻ + 14H⁺ → 2Cr³⁺ + 3I₂ + 7H₂O and I₂ + 2S₂O₃²⁻ → 2I⁻ + S₄O₆²⁻. What volume of thiosulphate is needed? →
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