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8.7gm of pyrolusite (impure MmO(2)) wer...

8.7gm of pyrolusite (impure `MmO_(2)`) were heated with concentrated HCl. The `Cl_(2)` gas evolved was passed through excess of KI solution. The iodine gas evolved required 80ml of `(N)/(10)` hypo solution.
The precentage of `MnO_(2)` in pyrolusite will be : `[Mn=55]`

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