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0.261 g of a sample of pyrolusite was h...

`0.261` g of a sample of pyrolusite was heated with excess of HCl and the chlorine evolved was passed in a solution of Kl . The liberated iodine requuired 90 mL `N/30 Na_(2)S_(2)O_(3)`. Calculate the percentage of `MnO_(2)` in the sample.

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The correct Answer is:
`9.24%`
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