What is the change in oxidation number of manganes in the reaction represented by the following equation? MnO-4(aq) + 8H+(aq) + 5e- → Mn2+(aq) + 4H2O(l)

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A. +3 to + 2
B. + 4 to + 2
C. + 5 to + 2
D. + 7 to 2

Correct Answer: Option D

D. + 7 to 2

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