A 1.0g sample of pyrolusite ore containing MnO_2 (MW = 87)was dissolved in a concentrated HCI solution and liberated Cl_2(g) was passed through a concentrated KI solution releasing I_2 . If the liberated iodine required 16mL of 1.25 M sodium thiosulphate (Na_(2)S_(2)O_3)solution, mass percentage of MnO_2in the given sample is

A 1.0g sample of pyrolusite ore containing MnO_2 (MW = 87)was dissolve

1.	A 1.0g sample of pyrolusite ore containing MnO_2 (MW = 87)was dissolved in a concentrated HCI solution and liberated Cl_2(g) was passed through a concentrated KI solution releasing I_2 . If the liberated iodine required 16mL of 1.25 M sodium thiosulphate (Na_(2)S_(2)O_3)solution, mass percentage of MnO_2in the given sample is
Answer» ` 43.5% ` `87%` ` 21.75 %` `0.875%` Solution :No.of eqts. `MnO_2` = No.of m.eqts .of `CI_2=` = No.of eqts .KI = No.of m.eqts. hypo No.of m.eqts of `MnO_(2)= 16x×1.25 = 16xx5/4=20` No.of milli MOLES of `MnO_(2)=10` Weight of `MnO_(2)=10`Weight % of `MnO_(2) =10xx87xx10^(-3)=0.87g` Weight % of `MnO_(2)=(0.87)/1 xx100 =87%`