Chapter 14, Problem 54QP

Balance the following half-reactions, adding ${\text{OH}}^{-}\left(aq\right),{\text{H}}_2\text{O}\left(l\right),$ and electrons as appropriate.

$\begin{array}{l}\left(\text{a}\right){\text{ CrO}}_4^{2-}\left(aq\right)\to \text{Cr}{\left(\text{OH}\right)}_3\left(s\right)\hfill \\ \left(\text{b}\right){\text{ C1O}}_{\text{2}}\left(aq\right)\to {\text{C1O}}^{-}\left(aq\right)\hfill \\ \left(\text{c}\right){\text{ MnO}}_4^{-}\left(aq\right)\to {\text{MnO}}_{\text{2}}\left(s\right)\hfill \\ \left(\text{d}\right){\text{ Br}}^{-}\left(aq\right)\to {\text{BrO}}_2^{-}\left(aq\right)\hfill \end{array}$