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

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25cm^3 of a discerption of X2O5 of attention 0.100 mol/dm^3 is subsided by sulphur dioxide to a inferior oxidation declare. To reoxidise X to its pristine oxidation estimate required 50cm^3 of 0.02 mol/dm^3 of potassium manganate discerption.

(i) What is the oxidation declare of X in X2O5?

(ii) To what oxidation estimate was X subsided by sulphur dioxide?

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