Chapter 18, Problem 2E

Balance each redox reaction occurring in acidic aqueous solution.
a. $\text{Zn}\left(s\right)+{\text{Sn}}^{\text{2}+}\left(aq\right)\to {\text{Zn}}^{\text{2}+}\left(aq\right)+\text{Sn}\left(s\right)$

b. $\text{Mg}\left(s\right)+{\text{ Cr}}^{\text{3}+}\left(aq\right)\to {\text{Mg}}^{\text{2}+}\left(aq\right)+\text{Cr}(s)$

c. ${\text{MnO}}_{\text{4}}{}^{-}\left(aq\right)+\text{Al}\left(s\right)\to {\text{Mn}}^{\text{2}+}\left(aq\right)+{\text{A1}}^{\text{2}+}\left(aq\right)$