1.

In the reaction, `MnO_(4)^(-1)(aq)+Br^(-1)(aq)toMnO_(2)(s)+BrO_(3)^(-1)(aq)`, the correct change in oxidation number of the species involved isA. `Br^(+5)toBr^(-1)`B. `Mn^(+7)toMn^(+2)`C. `Mn^(+7)toMn^(+3)`D. `Br^(-1)toBr^(+5)`

Answer» Correct Answer - D
`overset(+7)MnO_(4)^(-1)(aq)+Br^(-1)(aq)tooverset(+4)MnO_(2)(s)+overset(+5)BrO_(3)(aq)`
In the above reaction, oxidation number of Mn in `MnO_(4)^(-1)`(aq) decreases from + 7 to+ 4 in `MnO_(2)` (s) and oxidation number of `Br^(-)` increase from -1 (in `Br^(-)` (aq) to + 5 (in `BrO_(3)^(-1)`(aq) ). Thus, the correct option is (d).


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