The standard electrode potential (EΘ) values of Al3+/Al, Ag+/Ag, K+/K and Cr3+/Cr are −1.66 V, 0.80 V,−2.93 V and −0.74 V, respectively. The correct decreasing order of reducing power of the metal is -
1
K > Al > Ag > Cr
2
Al > K > Ag > Cr
3
Ag > Cr > Al > K
4
K > Al > Cr > Ag