Given that the standard electrode potentials `(E^(@))` of metals are:
`K^(+)//K = -2.93 V, Ag^(+)//Ag = 0.80 V, Cu^(2+)//Cu = 0.34 V, Mg^(2+)//Mg = -2.37 V, Cr^(3+)//Cr = -0.74 V, Fe^(2+)//Fe = -0.44 V`.
Arrange these metals in an increasing order of their reducing power.

Explanation

Greater the negative value of the standard electrode potential `(E^(@))`, greater is the reducing power of the electrode. The increasing order of reducing power is:
`Ag^(+)//Ag lt Cu^(2+)//Cu lt Fe^(2+) //Fe lt Cr^(3+)//Cr lt Mg^(2+) //Mg lt K^(+)//K`