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Question

Which compound among the following has the lowest oxidation number of Mn?
KMnO4,K2MnO4,MnO2 and Mn2O3.

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Solution

Mn2O3 has the lowest oxidation number of Mn.
The oxidation number of Mn in Mn2O3 is +3.
Let X be the oxidation number of Mn in Mn2O3.
2X+3(2)=0
2X6=0=0
X=+3.
The oxidation number of Mn in KMnO4,K2MnO4,MnO2 is +7, +6 and +4 respectively.

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