Question

in the conversion of Br2=BrO3-,the oxidation state of bromine changes from a) -1to -1 b) 0 to -1 c) 0 to +5 d) 0 to -5 plz answer it fast it's urgent.......

Answer 1

The answer is C. 0 to +5

Answer 2

Answer: c) 0 to +5

Explanation: Bromine $Br_2$ in its standard state has oxidation state of zero and it changes to $BrO_3^$ where oxidation state of Br is +5. Thus it is undergoing oxidation as the oxidation number of the element bromine is increasing.

$Br^xO^{-2}_3^=-1$  

if x is the oxidation state of Br, oxidation state of oxyge is -2.

Thus x+3(-2)=-1, x-6=-1, x=+5

$Br_2\rightarrow BrO_3^-$