5 g of pyrolusite (impure MnO2) was heated with conc. HCl and Cl2 evol – InterviewSolution

1.	5 g of pyrolusite (impure MnO2) was heated with conc. HCl and Cl2 evolved was passed through excess of KI solution. The iodine liberated required 40 mL of N10 hypo solution. Find the % of MnO2 in the pyrolusite (atomic mas of Mn = 55 amu).
Answer» 5 g of pyrolusite (impure $M n O_{2}$ ) was heated with conc. $H C l$ and $C l_{2}$ evolved was passed through excess of $K I$ solution. The iodine liberated required 40 mL of $\frac{N}{10}$ hypo solution. Find the $%$ of $M n O_{2}$ in the pyrolusite (atomic mas of Mn = 55 amu).

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