In the conversion of `Br_(2)toBrO_(3)^-1` the oxidation state of bromine changes from ......... to +5.

Explanation

To determine the change in oxidation state of bromine in the conversion from \( Br_2 \) to \( BrO_3^{-1} \), we can follow these steps:

### Step 1: Identify the oxidation state of bromine in \( Br_2 \)
- In the diatomic molecule \( Br_2 \), each bromine atom is in its elemental form. The oxidation state of any element in its pure form is always 0.
- Therefore, the oxidation state of bromine in \( Br_2 \) is 0.

### Step 2: Determine the oxidation state of bromine in \( BrO_3^{-1} \)
- In the bromate ion \( BrO_3^{-1} \), we need to calculate the oxidation state of bromine.
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