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Question

The number of moles of H2O2 needed to reduce 1 mole of KMnO4 in acidic medium are:

A
2 moles
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B
2.5 moles
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C
5 moles
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D
3 moles
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Solution

The correct option is D 2.5 moles
The overall reaction is, 6H++2MnO4+5H2O25O2+2Mn2++8H2O.

Therefore, the valency factor of H2O2 is 2. Since, the valency factor of KMnO4 is 5 in acidic medium, the number of moles required to reduce is 52 moles.
Option B is correct.

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