Question

What is the oxidation number of Br in BrO4?

Answer 1

Answer:

4

Explanation:

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Answer 2

The oxidation number of Br in $BrO^{-}_{4}$ is +7.

Explanation:

Actually, $BrO^{-}_{4}$ ion is formed when acid $HBrO_{4}$ tends to dissociates as follows.

       $HBrO_{4} \rightarrow H^{+} + BrO^{-}_{4}$

So, in $BrO^{-}_{4}$ the oxidation number of oxygen atom is -2 and overall charge on the ion is -1. Therefore, oxidation number of Br will be calculated as follows.

          Br + 4(-2) = -1

          Br = -1 + 8

               = +7

Therefore, in $BrO^{-}_{4}$ the oxidation state of Br is +7.

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