Question

Given, $E_{ I _{2} / I ^{-}}^{\circ}(1\, M )=+0.54\, V$, and $E_{ Br _{2} / Br ^{-}}^{\circ}(1\, M )=1.09\, V$
On this basis the feasible reaction is

• A. $2 Br ^{-}+ I _{2} \longrightarrow Br _{2}+2 I ^{-}$
• B. $I _{2}+ Br _{2} \longrightarrow 2 I ^{-}+2 Br ^{-}$
• C. $2 I ^{-}+ Br _{2} \longrightarrow I _{2}+2 Br ^{-}$
• D. $2 I ^{-}+2 Br ^{-} \longrightarrow I _{2}+ Br _{2}$

Answer 1

Answer: (C)

$E_{\text {cell }}^{\circ}=1.09-0.54=+0.55\, V$
Positive $E_{\text {cell }}^{\circ}$ means reaction is feasible.