Chapter 23, Problem 24E

You are given these three reducing agents: Zn(s); $S{n}^{2+}\left(aq\right)$ , and $i^{-}\left(aq\right)$ . Use data from Appendix D to determine which of them can, under standard-state conditions in acidic solution, reduce
a. $C{r}_2{O}_7{}^{2-}\left(aq\right)$ to $C{r}^{2+}\left(aq\right)$
b. $C{r}^{2-}\left(aq\right)$ to $C{r}^{2+}\left(aq\right)$
c. $S{O}_4{}^{2-}\left(aq\right)$ to $S{O}_2\left(g\right)$