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Question

The number of electrons involved in the conversion of MnO4toMnO2 is:

A
3
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B
4
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C
1
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D
2
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Solution

The correct option is A 3
Given reaction:
MnO4MnO2
Calculate the oxidation state of reactant and product as
Let the oxidation number of Mn be 'x'.
Oxidation number of O=2.
in MnO4: x+4×(2)=1
x=1+8 or x=+7
in MnO2: x+2×(2)=0
x4=0 or x=+4
Therefore Change in oxidation number = 7-4=3
The number of electrons involved in the conversion of MnO4 to MnO2 is 3.

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