d
$3{{\overset{0}{\mathop{Br}}\,}_{2}}+6CO_{3}^{2-}+3{{H}_{2}}O\,\,\,\,\to \,\,\,5{{\overset{-1}{\mathop{Br}}\,}^{-}}+\overset{+5}{\mathop{Br}}\,O_{3}^{-}+6ClO_{3}^{-}$
${\mathop {Br}\limits^0 _2}\,\,\,\, \to \,\,\,\,B{r^ - }$ (રિડક્શન)
${\mathop {Br}\limits^0 _2}\, \to \,\mathop {Br}\limits^{ + 5} O_3^ - $ (ઓક્સિડેશન)