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OpenStudy (anonymous):
25cm^3 of a solution of X2O5 of concentration 0.100 mol/dm^3 is reduced by sulphur dioxide to a lower oxidation state. To reoxidise X to its original oxidation number required 50cm^3 of 0.02 mol/dm^3 of potassium manganate solution. To what oxidation number was X reduced by sulphur dioxide?
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