A 0.1g sample of pyrolusite ore containing MnO_(2)(MW = 87) was dissolved in a concentrated HCI solutiona and liberated CI_(2)(g) was passed through a concentrated KI solution releasing I_(2) if the liberated iodine required 16 ml of 1.25M sodium thiosulphate (Na_(2)S_(2)O_(3)) solution, mass percentage of MnO_(2) in the given sample is

A 0.1g sample of pyrolusite ore containing MnO_(2)(MW = 87) was dissol

1.	A 0.1g sample of pyrolusite ore containing MnO_(2)(MW = 87) was dissolved in a concentrated HCI solutiona and liberated CI_(2)(g) was passed through a concentrated KI solution releasing I_(2) if the liberated iodine required 16 ml of 1.25M sodium thiosulphate (Na_(2)S_(2)O_(3)) solution, mass percentage of MnO_(2) in the given sample is
Answer» `43.5%` `87%` `21.75%` `0.875%` Solution :No. of m.eqts `MnO_(2) =` No. of m.eqts of `Cl_(2)` = No. of m.eqts of `KI =` No. of m.eqts hypo No. of m.eqts `= MnO_(2) = 16 xx 1.25 = 16 xx (5)/(4) =20` No. of milli MOLES of `MnO_(2) = 10` WEIGHT of `MnO_(2) = 10 xx 87 xx 10^(-3) = 0.87g` weight % of `MnO_(2) = (0.87)/(1) xx 100 = 87%`