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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 in each case respectively are:

A
1,3,4,5
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B
3,2,1,4
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C
1,5,3,7
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D
4,3,2,1
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Solution

The correct option is C 1,3,4,5
When KMnO4 acts as an oxidising agent and ultimately forms MnO24,MnO2,Mn2O3 and Mn2+
, then the number of electrons transferred in each case are 1,3,4,5 respectively.

The oxidation number of Mn in KMnO4, MnO24,MnO2,Mn2O3 and Mn2+ is 7, 6, 4, 3 and 2 respectively.

The number of electrons transferred corresponds to the change in the oxidation number.
For example, when KMnO4 forms MnO24, the change in the oxidation number is 76=1. Hence, the number of electrons transferred is 1.

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