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Complete the following reactions.
(i) `MnO_4^(-)+2H_2O+3e^(-)to"_________"+4OH^(-)`
(ii) `MnO_4^(-)+8H^(+)+5e^(-)to "__________" +4H_2O`
(iii) `MnO_4^(-)+e^(-)to "_________"`
A. `MnO_4^(-),Mn^(2+),MnO_4^(2-)`
B. `Mn^(2+),MnO_2,MnO_4^(2-)`
C. `MnO_4^(2-),Mn^(2+),MnO_2`
D. `MnO_2,MnO_4^(2-),Mn^(2+)`

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