PART B: Balance the following using Oxidation Numbers \begin{aligned} &\text { 1. }\\ &\mathrm{MnO}_{4}^{-}+\mathrm{CN}^{-} \rightarrow \mathrm{MnO}_{2}+\mathrm{CNO} \end{aligned} \begin{aligned} &\text { 2. }\\ &\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{I} \rightarrow \mathrm{I}_{2}+\mathrm{Cr}^{3+} \end{aligned}