Chapter 7, Problem 86E

Which reactions are redox reactions?

a. $\text{Al}\left(s\right)+3{\text{ Ag}}^{\text{+}}\left(aq\right)\to {\text{Al}}^{\text{3+}}\left(aq\right)+3\text{ Ag}\left(s\right)$

b. $4\text{ K}\left(s\right)+{\text{O}}_{\text{2}}\left(g\right)\to {\text{2 K}}_{\text{2}}\text{O}\left(s\right)$

c. ${\text{SO}}_{\text{3}}\left(g\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)\to {\text{H}}_{\text{2}}{\text{SO}}_{\text{4}}\left(aq\right)$

d. $\text{Mg}\left(s\right)+{\text{Br}}_{\text{2}}\left(l\right)\to {\text{MgBr}}_{\text{2}}\left(s\right)$