Chapter 19.3, Problem 3CP

What redox reaction, if any. will occur at $\text{25°C}$ when Al metal is placed in a solution that is $\text{1}\text{.0 }M{\text{ in Cr}}^{\text{3+}}\text{?}$

$\begin{array}{l}\text{a)}\hfill \\ {\text{Al}}^{\text{3+}}\text{+ Cr}\underset{}{\to }{\text{ Al + Cr}}^{\text{3+}}\hfill \\ \text{b)}\hfill \\ {\text{Cr}}^{\text{3+}}\text{+ Al }\underset{}{\to }{\text{Cr + Al}}^{\text{3+}}\hfill \\ \text{c)}\hfill \\ {\text{Al}}^{\text{3+}}{\text{+ Cr}}^{\text{3+}}\underset{}{\to }\text{Al + Cr}\hfill \\ \text{d)}\hfill \\ \text{Al + Cr }\underset{}{\to }{\text{ Al}}^{\text{3+}}{\text{+ Cr}}^{\text{3+}}\hfill \\ \text{No redox reaction will occur}\text{.}\hfill \end{array}$