Chemistry - Electrochemistry Question with Solution | TestHub

$2\mathrm{KBr}+{\mathrm{I}}_2\to 2\mathrm{KI}+{\mathrm{Br}}_2$ reaction is not possible because ${\mathrm{Br}}^{-}$ion is not oxidised in ${\mathrm{Br}}_2$ with ${\mathrm{I}}_2$ due to higher electrode (oxidation) potential of ${\mathrm{I}}_2$ than bromine. Energetically favorable means no energy input needed for reaction to take place.