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1. Balance $\text{MnO}_4^-+\text{Fe}^{2+}\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Fe}^{3+}+\text{Mn}^{2+}$ in acidic medium by ion electron method.
2. Given the standard electrode potentials:

$\frac{\text{K}_+}{\text{K}}=-2.93\text{V},$

$\frac{\text{Ag}^+}{\text{Ag}}=+0.80\text{V},$

$\frac{\text{Mg}^{2+}}{\text{Mg}}=-2.37\text{V}$

Arrange these metals in order of increasing reducing power.