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 0.13 g of a specimen containing MnO_(2) is treated with iodide ions. If iodine liberated requires 30.0 " mL of " 0.075 M solution of Na_(2)S_(2)O_(3) , the percentage of MnO_(2) in the mineral is

A 0.13 g of a specimen containing MnO_(2) is treated with iodide ions. If iodine liberated requires 30.0 " mL of " 0.075 M solution of Na_(2)S_(2)O_(3) , the percentage of MnO_(2) in the mineral is

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.

A 0.2 g sample containing copper (II) was analysed iodometrically, where copper (II) is reduced to copper (I) by iodide ions. 2Cu^(2+) +4I^(-)rarr2 CuI+I_(2) If 20 mL of 0.1 M Na_(2)S_(2)O_(3) solution is required for titration of the liberated iodine, then the percentage of copper in the sample will be :

638.0 g of CuSO_(4) solution is titrated with excess of 0.2 M KI solution. The liberated I_(2) required 400 " mL of " 1.0 M Na_(2)S_(2)O_(3) for complete reaction. The percentage purity of CuSO_(4) in the sample is

638.0 g of CuSO_(4) solution is titrated with excess of 0.2 M KI solution. The liberated I_(2) required 400 " mL of " 1.0 M Na_(2)S_(2)O_(3) for complete reaction. The percentage purity of CuSO_(4) in the sample is