5 g of pyrolusite (impure `MnO_(2)` ) were heated with conc. HCl and `Cl_(2)` evolved was passed through excess of KI solution. The iodine liberated required 40 mL of `(N)/(10)` hypo solution. Find the % of `MnO_(2)` in the pyrolusite.

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]

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]

5g of a sample of bleaching powder is treated with excess acetic acid and KI solution. The liberated I_(2) required 50 mL of N/10 hypo. The % of available chlorine in the sample.

20ml of hydrogen peroxide solution is added to excess of acidified KI solution. The iodine so liberated requires 20ml of 0.1M hypo solution. Calculate the molarity and percentage strength of H_2O_2 solution.