Q. Which one of the following reactions does not occur ?
A) $F_{2} + Cl^{-}\ \longrightarrow \ 2F^{-} + Cl_{2}$
B) $Cl_{2} + 2F^{-} \longrightarrow {2Cl^{-} + F}_{2}\$
C) $Br_{2} + 2I^{-} \longrightarrow 2Br^{-} + I_{2}$
D) $Cl_{2} + 2{Br}^{-} \longrightarrow 2Cl^{-} + Br_{2}$
Explanation
(b)
With progressive increase in atomic number, the reduction potential of halogen decreases thus oxidizing power also decreases. Hence a halogen with lower atomic number will oxidise the halide ion of higher atomic number and therefore will liberate them from their salt solution.
Cl_{2} + $2F^{-}$ ⟶$2CI^{-}$ + F_{2}
is not possible_{.}
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.