Some Basic Concepts of Chemistry - Result Question 94

####32. Hydrogen peroxide solution (20mL) reacts quantitatively with a solution of KMnO4(20mL) acidified with dilute H2SO4. The same volume of the KMnO4 solution is just decolourised by 10mL of MnSO4 in neutral medium simultaneously forming a dark brown precipitate of hydrated MnO2. The brown precipitate is dissolved in 10mL of 0.2M sodium oxalate under boiling condition in the presence of dilute H2SO4. Write the balanced equations involved in the reactions and calculate the molarity of H2O2.

(2001)

Show Answer

Solution:

 Weight of a compound in gram (w)= Number of moles (n)

Molar mass (M)

= Number of molecules (N) Avogadro number (NA) w(O2)32=N(O2)NA

And

w(N2)28=N(N2)NA

Dividing Eq. (i) by Eq. (ii) gives

N(O2)N(N2)=w(O2)w(N2)×2832 =14×2832=732



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक