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Question

 Find the n-factor in the following chemical changes. 
KMnO4  H+  −−Mn2+



 
  1. 4
  2. 2
  3. 3
  4. 5


Solution

The correct option is D 5
Steps for finding valency factor/n-factor:
1. Find the oxidation state (O.S.) of metal in reactant side.
2. Find the oxidation state of metal in product side.
3. Take the magnitude of difference of two oxidation state |O.S.ProductO.S.Reactant|×number of atom for the valency factor
KMnO4  H+  −−Mn2+
O.S. of  Mn in reactant side
=+1+x+4×(2)=0
x=+7
O.S. of  Mn in product side=+2
valency factor=number of Mn atom×|O.S.ProductO.S.Reactant| 
valency factor=1×|+27| 
valency factor=5 



 

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