A 3.00 g sample containing `Fe_3O_4, Fe_2O_3` and an inert impure substance is treated with excess of KI solution in pre

Ask a Question


Question Asked by a Student from EXXAMM.com Team


Q 1119856719.     A 3.00 g sample containing `Fe_3O_4, Fe_2O_3` and an inert impure substance is treated with excess of KI solution in presence of dilute `H_2SO_4`. The entire iron is converted into `Fe^(2+)` along with the liberation of iodine. The resulting solution is diluted to 100 mL. A 20 mL aliquot of the diluted solution requires 11.0 mL 0.5 M `Na_2S_2O_3` solution to reduce the iodine present. A 50 mL of the diluted solution after complete extraction of the iodine requires 12.80 mL of 0.25 M `K.MnO_4` solution in dilute `H_2SO_4` medium for the oxidation of `Fe^(2+)`. What is the percentage of `Fe_2O_3` in the original sample?


A

`23.5`

B

`55.2`

C

`49.1`

D

`40.7`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

Find instant solution to any question from our database of 1.5 Lakh + Questions

 


Access free resources including

  • 100% free video lectures with detailed notes and examples
  • Previous Year Papers
  • Mock Tests
  • Practices question categorized in topics and 4 levels with detailed solutions
  • Syllabus & Pattern Analysis

Engineering


Medical


Banking


DEFENCE


SSC


RRB


CBSE-NCERT


OLYMPIAD