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Question

Following reaction is:
MnO4(aq)MnO24(aq)

A
reduction
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B
oxidation
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C
neither oxidation nor reduction
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D
none of these
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Solution

The correct option is B reduction
The unbalanced half reaction MnO4(aq)MnO24(aq) is reduction.
The oxidation number of Mn in MnO4 and MnO24 is +7 and +6 respectively.
Thus, there is decrease in the oxidation number which indicates reduction.

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