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Find the oxidation number of Mn in MnO2 , Mn2O3 and Mn2O7

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Find the oxidation number of Mn in MnO2 , Mn2O3 and Mn2O7

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Best answer

MnO2 

Mn + 2x -2 = 0 

Mn + 4 = 0

Mn = +4 

Mn2O3 

2Mn + 2x -2 = 0 

2Mn + -4 = 0 

2 Mn = +4 

Mn = +2 

Mn2O7 

2Mn + -2×7 = 0 

2Mn + -14 = 0 

2Mn = +14 

Mn = +7

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