MnO4- + Br- + H2O →MnO2 +BrO3- +OH- ; for the balanced reaction the coefficients of MnO4-;BrO3-;OH- is respectively

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1, 1, 2

2, 1, 4

2, 1, 2

1, 2, 2

answer is C.

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Detailed Solution

Mn+7O4-+Br-+H2O→Mn+4O2+Br+5O3-+OH-; 6MnO4-+3Br-+3H2O→6Mn O2+3Br O3-+6OH-;6MnO4- : 3Br O3- : 6OH- 2 :1 : 2

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