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Question

When KMnO4 acts as an oxidising agent and ultimately forms MnO24,MnO2, Mn2O3 and Mn2+, then the number of electrons transferred per molecule of KMnO4 in each case respectively, is:

A
4, 3, 1, 5
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B
1, 5, 3, 7
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C
1, 3, 4, 5
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D
3, 5, 7, 1
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Solution

The correct option is C 1, 3, 4, 5
Change in oxidation of Mn as the reactions are given below:
+7MnO4+e+6MnO24 ; Change in oxidation is 1
+7MnO4+3e+4MnO2 ; Change in oxidation is 3
+7MnO4+4e+3Mn2O3 ; Change in oxidation is 4
+7MnO4+5e+2Mn ; Change in oxidation is 5
Hence, the change is 1, 3, 4, 5 respectively.

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