Question

5. 10 g of Mno, on reaction with HCl forms 2.24 L of Cl2(9) at NTP, the percentage impurity of Mno, is MnO, + 4HCI -> MnCl2 + Cl2 + 2H2O (1) 87% (2) 25% (3) 33.3% (4) 13%
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Answer 1

Answer:

0.5 g of pyrolusite (naturally occurring MnO

2

) were boiled with excess of conc. HCl and the issuing gas was passed through a solution of potassium iodide, when 0.635 g of iodide were liberated. What was the percentage of pure MnO

2

in the pyrolusite sample? [Mn=55;Cl=35.5;K=39;I=127]