Question

A 3.4 g sample of H2O2 solution containing
x% H,O, by mass requires x mL of a KMnO4
solution for complete oxidation under acidic
condition. The molarity of KMnO4 solution is
(A) 1 (B) 0.5 (C) 0.4 (D) 0.2
Decod
civendingram which of the
which of the​

Answer 1

Molarity :→ The moles of solute present in one litre of solution is known as molarity.

∵100gm of KMnO  4 solutions contain xgm of H  2 O

 ∴1gm of KMnO  4

​ solutions contain   100 x  gm of H  2  O  

∴3.4gm ______   100 x ×3.4 of H  2 O (gm) moles of H  2 0

=100 x 34

​

(34= Mol wt of H  2 O

=x×10  −3

moles

∴  molarity =  

VolumeofKMnO  

4

​  

solutionin(lt)

molesofH  

2

​  

O  

2

​  

 

​  

 

=  

xml×10  

−3

 

x×10  

−3

mole/lt

​  

 

=1mol/lt