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Question:

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives:

Mn2+andO2

Mn4+andO2

Mn2+andO3

Mn4+andMnO2

Solution:

The reaction of aqueous KMnO4 with H2O2 in acidic conditions gives: 3H2SO4 + 2KMnO4 + 5H2O2 → 5O2 + 2MnSO4 + 8H2O + K2SO4
The oxidation number of Mn in MnSO4 is +2. Hence, option B is correct.