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1.355 g of pyrolusite sample are added t...

1.355 g of pyrolusite sample are added to 50 mL of 1 N oxalic acid solution containing sulphuric acid. After the reaction is completed, the contents are transferred to a measuring flask and the volume made up to 200 mL. 20 mL of this solution is titrated against `KMnO_(4)` solution whose strength is `2 g//L` and 31.6 mL of `KMnO_(4)` solution are required. Calculate the percentage purity in the given sample of pyrolusite.

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The correct Answer is:
0.9631
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