Question

Given

$E_{C{l}_2/C{l}^{-}}^o=1.36V,E_{C{r}^{3+}/Cr}^o=-0.74V$

$E_{C{r}_2{O}_7^{2-}/C{r}^{3+}}^o=1.33V,E_{Mn{O}_4^{-}/M{n}^{2+}}^o=1.51V.$

Among the following, the strongest reducing agent is:

• A. $M{n}^{2+}$
• B. $C{r}^{3+}$
• C. $C{l}^{-}$
• D. $Cr$

Answer 1

Answer: (D)

According to the given data standard reduction potential of $Cr$ is lowest. Lower the standard reduction potential, stronger the reducing agent. Therfore $Cr$ is the strongest reducing agent.