In the conversion of $B r_{2}$ to $B r O_{3}^{-}$ the oxidation state of bromine changes from:

0

+ 5

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- 1

+ 5

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0

- 3

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+ 2

+ 5

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Solution

The correct option is A $0$ to $+ 5$
Oxidation state of an atom refers to the total number of electrons gain or lost by the atom form a molecule.

$B r_{2}$ is converted to $B r O_{3}^{-}$ .
Oxidation state of Bromine in $B r_{2} = 0$
Oxidation state of Bromine in $B r O_{3}^{-} = + 5$

Oxidation state of bromine changes from 0 to +5.

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