Question

Electrode potential data are given
$F{e}_{\left(aq\right)}^{3+}+e^{-}\to F{e}_{\left(aq\right)}^{2+}$; $E^o=+0.77$V
$A{l}_{\left(aq\right)}^{3+}+3e^{-}\to A{l}_s;E^o=-1.66$V
$B{r}_{2\left(aq\right)}+2e^{-}\to 2B{r}_{\left(aq\right)}^{-};E^o=+1.66$V
Based on the given data which statement(s) is/are incorrect?

• A. $F{e}^{2+}$ is stronger reducing agent than $B{r}^{-}$
• B. $F{e}^{3+}$ is stronger oxidizing agent than $A{l}^{+3}$
• C. $Al$ is stronger reducing agent than $F{e}^{2+}$
• D. $B{r}^{-}$ is stronger reducing agent than $Al$

Answer 1

The correct option is D $B{r}^{-}$ is stronger reducing agent than $Al$

Standard reduction potential of ${Fe}^{3+},{Al}^{3+}$ and ${Br}_2$ are $+0.77V,-1.66V$ and $+1.66V$ respectively.

$A{l}^{3+}>{Fe}^{3+}>{Br}_2$

Increasing strength of reducing agent. So, $Al$ is stronger reducing agenct than ${Br}^{-}$.