Arrange these metals in their increasing order of reducing power.

Given the standard electrode potentials,

K⁺/K = -2.93 V, Ag⁺|Ag = 0.80 V
Hg²⁺|Hg = 0.79 V
Mg²⁺|Mg = -2.37 V, Cr³⁺|Cr = -0.74V

Arrange these metals in their increasing order of reducing power.