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Question

The number of moles H2O2 needed to reduce 1 mole of KMnO4 in acidic medium is
  1. 2
  2. 2.5
  3. 5
  4. 3


Solution

The correct option is B 2.5
2KMnO4+3H2SO4+5H2O22MnSO4+K2SO4+8H2O+5O2
1 mole
2KMnO4=5H2O2
1KMnO4=2.5H2O2

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