Q. Which of the following reactions is correct for a given electrochemical cell at 25 ℃? $Pt\ |\ {Br}_{2}(g)\ |\ {Br}^{-}(g)\ ||\ {Cl}^{-}(aq)\ |\ {Cl}_{2}(g)\ |\ Pt$
A) ${2Br}^{-}(aq) + \ {Cl}_{2}(g) \longrightarrow \ {2Cl}^{-}(aq) + \ {Br}_{2}(g)$
B) $Br_{2}\ (g)\ + \ 2Cl^{-}\ (aq)\ \longrightarrow \ 2Br^{-}\ (aq) + \ Cl_{2}\ (g)$
C) $Br_{2}\ (g)\ + \ Cl_{2}\ (g)\ \longrightarrow \ 2Br^{-}\ (aq)\ + \ \ 2Cl^{-}\ (aq)$
D) $2Br^{-}\ (aq)\ + \ 2Cl^{-}\ (aq)\ \longrightarrow \ Br_{2}\ (g)\ + \ Cl_{2}\ (g)$
Explanation
(a)
${2Br}^{-}(aq) + \ {Cl}_{2} \longrightarrow \ {2Cl}^{-}(aq) + \ {Br}_{2}$
Bromine is relased by chlorine as more reactive halogen displaces less reactive halogen from their salt solutions.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.