Given the standard electrode potentials, A g^{+} / A g=0.80 \mathrm{~V} \mathrm{Hg}^{2+} / \mathrm{Hg}=0.79 \mathrm{~V} \mathrm{Mg}^{2+} / \mathrm{Mg}=-2.37 \mathrm{~V} C r^{3+} / C r=-0.74 V Arrange these metals in their increasing order of reducing power.