Chemistry - Redox Reactions Question with Solution | TestHub

A$2.0 \mathrm{g}$sample containing${\mathrm{MnO}}_2$is treated with$\mathrm{HCl}$liberating${\mathrm{Cl}}_2$. The${\mathrm{Cl}}_2$gas is passed into a solution of$\mathrm{KI}$and$60.0\mathrm{mL}$of$0.1{\mathrm{MNaS}}_2{\mathrm{O}}_3$is required to titrate the liberated iodine. The percentage of${\mathrm{MnO}}_2$in the sample is____. Nearest integer)
[Atomic masses (in$\mathrm{u}$)$\mathrm{Mn}=55;\mathrm{Cl}=35.5:\mathrm{O}=16,\mathrm{I}=127,\mathrm{Na}=23,\mathrm{K}=39,\mathrm{S}=32$]