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Question

When KMnO4 acts as an oxidising agent and forms MnO2, the number of electrons transferred per molecule of KMnO4 is :

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Solution

Reaction when KMnO4 acts as an oxidising agent and forms MnO2 is given below:
+7MnO4+3e+4MnO2
The oxidation state of Mn in MnO4 and MnO2 are +7 and +4 respectively.
Therefore, change in oxidation state is 3 which is the number of electrons transferred per molecule.

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