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

8.7 gm of pure MnO_(2) is heated with an excess of HCl and the gas evolved is passed into a solution of KI. The amount of I_(2) liberated is [Atomic mass O = 16, Mn = 55]

8.7 gm of pure MnO_(2) is heated with an excess of HCl and the gas evolved is passed into a solution of KI. The amount of I_(2) liberated is [Atomic mass O = 16, Mn = 55]

1 gram of pyrolusite (MnO_(2)) was boiled with excess of concentrated HCl and the issuing gas was passed through a solution of potassium iodide when 1.27 g of iodide were liberated. What is the percentage of pure MnO_(2) in the sample ?

A 0.5 g sample containing MnO_(2) is treated with HCl liberating Cl_(2) is passed into a solution of KI and 30.0 " mL of " 0.1 M Na_(2)S_(2)O_(3) are required to titrate the liberated iodine. Calculate the percentage of MnO_(2) is the sample.

A 0.5 g sample containing MnO_(2) is treated with HCl liberating Cl_(2) is passed into a solution of KI and 30.0 " mL of " 0.1 M Na_(2)S_(2)O_(3) are required to titrate the liberated iodine. Calculate the percentage of MnO_(2) is the sample.