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Question

How many moles of KMnO4 are reacted with one mole of ferrous oxalate in an acidic medium?
  1. 25
  2. 15
  3. 35
  4. 53


Solution

The correct option is C 35
2KMnO4+5C2O24+16H+2Mn2++2K++10CO2+8H2O
KMnO4+5Fe2++8H+K++5Fe3++Mn2++4H2O

From the above equations, it is observed that 3 moles of KMnO4 will be needed to react completely with five moles of ferrous oxalate in acidic solution.
No. Of equivalents of KMnO4=no. Of equivalents of FeC2O4
Equiv. OfKMnO4=n×no.Of moles=5×x.
Equivalents of FeC2O4=3×1=3
5x=3
x=3/5

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