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1. Complete the following equations:

1. $\text{Cr}_{2}\text{O}_{7}^{2-}+\text{2OH}^{-}\rightarrow$
2. $\text{MnO}_{4}^{-}+\text{4H}^{+}+\text{3e}^{-}\rightarrow$

2. Account for the following:

1. Zn is not considered as a transition element.
2. Transition metals form a large number of complexes.
3. The $E ^{\circ}$ value for the $Mn ^{3+} / Mn ^{2+}$ couple is much more positive than that for $Cr ^{3+} / Cr ^{2+}$ couple.